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33-705: The median age is relatively low; 23% of the population are under 15 years old. Siilinjärvi has eleven elementary schools and two secondary schools (one is located in Suininlahti and one downtown). The Kuopio Airport is located in the village of Rissala in Siilinjärvi along the Highway 9 . The airport is also the home of the Karelian Air Command and the 31st Squadron of the Finnish Air Force . Siilinjärvi

66-450: A fire truck PS 1512, a tank truck PS 153, a crew transport, an off-road and boat tractor PS 157, and a snowmobile and boat. Yara TPK has a fire truck PS 191 and a boat. In addition, it has been proposed to build a third fire station in Siilinjärvi near the Vuorela residential area. A local newspaper called Uutis-Jousi is published in Siilinjärvi. Siilinjärvi also has its own library . In

99-408: A population pyramid can even give insight into the economic status of a country from the age stratification since the distribution of supplies is not evenly distributed through a population. In the demographic transition model, the size and shape of population pyramids vary. In stage one of the demographic transition model, the pyramids have the most defined shape. They have the ideal big base and

132-453: A positive impact on overall economic growth, creating a demographic dividend. The ability of a particular economy to harness this dividend, however, is dependent on its ability to ensure the deployment of this growing working-age population towards productive economic activity, and to create the jobs necessary for the growing labor force." Population density Population density (in agriculture : standing stock or plant density )

165-477: A priority. The Middle East and North Africa are currently experiencing a prominent youth bulge. "Across the Middle East, countries have experienced a pronounced increase in the size of their youth populations over recent decades, both in total numbers and as a percentage of the total population. Today, the nearly 111 million individuals aging between 15 to 29 living across the region make up nearly 27 percent of

198-428: A skinny top. In stage two, the pyramid looks similar but starts to widen in the middle age groups. In stage three, the pyramids start to round out and look similar in shape to a tombstone. In stage four, there is a decrease in the younger age groups. This causes the base of the widened pyramid to narrow. Lastly, in stage five, the pyramid starts to take on the shape of a kite as the base continues to decrease. The shape of

231-489: A variety of reasons, women have a greater life expectancy. The shape of the pyramid can also reveal the age-dependency ratio of a population. Populations with a high proportion of children and/or of elderly people have a higher dependency ratio . This ratio refers to how many old and young people are dependent on the working-age groups (often defined as ages 15–64). According to Weeks' Population: an Introduction to Concepts and Issues, population pyramids can be used to predict

264-499: Is 53/km (140/sq mi). This includes all continental and island land area, including Antarctica . However, if Antarctica is excluded, then population density rises to over 58 per square kilometre (150/sq mi). The European Commission's Joint Research Centre (JRC) has developed a suite of (open and free) data and tools named the Global Human Settlement Layer (GHSL) to improve the science for policy support to

297-406: Is a graphical illustration of the distribution of a population (typically that of a country or region of the world) by age groups and sex; it typically takes the shape of a pyramid when the population is growing. Males are usually shown on the left and females on the right, and they may be measured in absolute numbers or as a percentage of the total population. The pyramid can be used to visualize

330-450: Is a measurement of population per unit land area. It is mostly applied to humans , but sometimes to other living organisms too. It is a key geographical term. Population density is population divided by total land area , sometimes including seas and oceans, as appropriate. Low densities may cause an extinction vortex and further reduce fertility. This is called the Allee effect after

363-499: Is around 8,000,000,000 and the Earth 's total area (including land and water) is 510,000,000 km (200,000,000 sq mi). Therefore, the worldwide human population density is approximately 8,000,000,000 ÷ 510,000,000 = 16/km (41/sq mi). However, if only the Earth's land area of 150,000,000 km (58,000,000 sq mi) is taken into account, then human population density

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396-420: Is shown on the x-axis (horizontal) while the age-groups are represented on the y-axis (vertical). The size of each bar can be displayed either as a percentage of the total population or as a raw number. Males are conventionally shown on the left and females on the right. Population pyramids are often viewed as the most effective way to graphically depict the age and distribution of a population, partly because of

429-589: Is the birthplace of politician and former prime minister of Finland and European Commissioner Jyrki Katainen . The main sources of income are services and industry . One of the most important employers in Siilinjärvi is Siilinjärvi apatite mine owned by Yara International . The other largest companies in Siilinjärvi are Yara International 's factory and apatite mine, Lujabetoni Oy, Hydroline Oy , Recreational Pool Fontanella and Spa Hotel Kunnonpaikka. 5% of jobs are in primary production, 29% in industry and construction and 66% in services. Unemployment figures are

462-631: The European Commission Directorate Generals and Services and as support to the United Nations system. Several of the most densely populated territories in the world are city-states , microstates and urban dependencies . In fact, 95% of the world's population is concentrated on just 10% of the world's land. These territories have a relatively small area and a high urbanization level, with an economically specialized city population drawing also on rural resources outside

495-532: The Middle East Youth Initiative as a demographic gift , which, if engaged, could fuel regional economic growth and development. "While the growth of the youth population imposes supply pressures on education systems and labor markets, it also means that a growing share of the overall population is made up of those considered to be of working age; and thus not dependent on the economic activity of others. In turn, this declining dependency ratio can have

528-547: The 16–29 age range is associated with risk-taking, especially among males. In general, youth bulges in developing countries are associated with higher unemployment and, as a result, a heightened risk of violence and political instability . For Cincotta and Doces (2011), the transition to more mature age structures is almost a sine qua non for democratization. To reverse the effects of youth bulges, specific policies such as creating more jobs, improving family planning programs, and reducing over all infant mortality rates should be

561-400: The 1980s, each of Savonia's then municipalities voted for its own title dishes. The traditional food of Siilinjärvi was a cockscomb , a potato gruel and a red berry kissel with whipped cream . Siilinjärvi is twinned with: [REDACTED] Media related to Siilinjärvi at Wikimedia Commons Median age A population pyramid (age structure diagram) or " age-sex pyramid "

594-531: The Tiprusniemi bioheat center, heat is produced with domestic wood fuel . In addition, Sulkavantie has a LPG back-up and peak heating center. In Siilinjärvi, groundwater is used as raw water , which is obtained from three groundwater intakes, two of which are located in the church village and one in the Toivala-Vuorela area. In addition to the municipal water supply plant , there are 15 water cooperatives in

627-420: The age of a particular population. It is also used in ecology to determine the overall age distribution of a population; an indication of the reproductive capabilities and likelihood of the continuation of a species. Number of people per unit area of land is called population density . A population pyramid often contains continuous stacked-histogram bars , making it a horizontal bar diagram. The population size

660-934: The area, illustrating the difference between high population density and overpopulation . Deserts have very limited potential for growing crops as there is not enough rain to support them. Thus, their population density is generally low. However, some cities in the Middle East, such as Dubai , have been increasing in population and infrastructure growth at a fast pace. Cities with high population densities are, by some, considered to be overpopulated, though this will depend on factors like quality of housing and infrastructure and access to resources. Very densely populated cities are mostly in Asia (particularly Southeast Asia ); Africa's Lagos , Kinshasa , and Cairo ; South America's Bogotá , Lima , and São Paulo ; and Mexico City and Saint Petersburg also fall into this category. City population and especially area are, however, heavily dependent on

693-451: The chances of non-ethnic civil wars, but not ethnic civil wars. A large population of adolescents entering the labor force and electorate strains at the seams of the economy and polity, which were designed for smaller populations. This creates unemployment and alienation unless new opportunities are created quickly enough – in which case a 'demographic dividend' accrues because productive workers outweigh young and elderly dependents. Yet

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726-547: The definition of "urban area" used: densities are almost invariably higher for the center only than when suburban settlements and intervening rural areas are included, as in the agglomeration or metropolitan area (the latter sometimes including neighboring cities). In comparison, based on a world population of 8 billion, the world's inhabitants, if conceptualized as a loose crowd occupying just under 1 m (10 sq ft) per person (cf. Jacobs Method ), would occupy an area of 8,000 square kilometres (3,100 sq mi)

759-687: The environment) and most genocides can be readily explained as a result of a built-up youth bulge. This factor has been also used to account for the Arab Spring events and the rise of extremist populism in the 2010s. Economic recessions , such as the Great Depression of the 1930s and the late 2000s Great Recession , are also claimed to be explained in part due to a large youth population who cannot find jobs. Youth bulge can be seen as one factor among many in explaining social unrest and uprisings in society. A 2016 study finds that youth bulges increase

792-595: The fertility and mortality rates of a country. Gary Fuller (1995) described a youth bulge as a type of expansive pyramid. Gunnar Heinsohn (2003) argues that an excess in especially young adult male population predictably leads to social unrest, war , and terrorism , as the "third and fourth sons" that find no prestigious positions in their existing societies rationalize their impetus to compete by religion or political ideology. Heinsohn claims that most historical periods of social unrest lacking external triggers (such as rapid climatic changes or other catastrophic changes of

825-407: The future, known as a population forecast. Population momentum , when a population's birth rates continue to increase even after fertility rate has declined to replacement level, can even be predicted if a population has a low mortality rate since the population will continue to grow. This then brings up the term doubling time , which is used to predict when the population will double in size. Lastly,

858-519: The lowest in North Savonia, averaging 9,4% in 2016, while at the same time the average unemployment rate in North Savonia was 13,4% and in the whole country 13,2%. Siilinjärvi's income tax rate in 2017 was 21,25. The use of district heating has increased in recent years. Most of the district heat is produced from the Yara plant's process waste heat and from Savon Voima's Tiprusniemi bioheat plant . At

891-591: The municipality's sparsely populated areas. There are two fire stations in the Siilinjärvi municipality, the North Savonia Rescue Department station and the Yara TPK station. Siilinjärvi's main fire station is located in Simonsalo at Sulkavantie 6, a few minutes' drive from the center of Siilinjärvi. The station has a 24-hour on-call service. Station 15 houses an inspection car PS 020, a fire truck PS 151,

924-450: The population is dependent upon what the economy is like in the country. More developed countries can be found in stages three, four, and five, while the least developed countries have a population represented by the pyramids in stages one and two. Each country will have a different population pyramid. However, population pyramids can be categorised into three types: stationary, expansive, or constrictive. These types have been identified by

957-428: The population lies in the youngest age band, such as ages 0–14, which suggests that the fertility rate of the country is high and above replacement fertility level. If a population is below replacement fertility level, the older population is declining with age, due to a combination of mortality and an increase in the number of births over time. There are usually more females than males in the older age ranges since, for

990-553: The region's population." Structural changes in service provision, especially health care, beginning in the 1960s created the conditions for a demographic explosion, which has resulted in a population consisting primarily of younger people. It is estimated that around 65% of the regional population is under the age of 25. The youth bulge in the Middle East and North Africa has been favorably compared to that of East Asia, which harnessed this human capital and saw huge economic growth in recent decades. The youth bulge has been referred to by

1023-443: The scientist who identified it. Examples of the causes of reduced fertility in low population densities are: Population density is the number of people per unit of area, usually transcribed as "per square kilometer" or square mile, and which may include or exclude, for example, areas of water or glaciers. Commonly this is calculated for a county , city , country , another territory or the entire world . The world's population

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1056-409: The type of population in a particular region. A population with an average age of 15 would be very young compared to one with an average age of 55. Population statistics are often mid-year numbers. A series of population pyramids could give a clear picture of how a country transitions from high to low fertility rates . If the pyramid has a broad base, this indicates that a relatively high proportion of

1089-432: The very clear image these pyramids provide. A great deal of information about the population broken down by age and sex can be read from a population pyramid, and this can shed light on the extent of development and other aspects of the population. The measures of central tendency ( mean , median , and mode ) should be considered when assessing a population pyramid. For example, the average age could be used to determine

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