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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 is around 8,000,000,000 [3 ...
Population. According to the 2016 population census the population of Iran was 79.9 million, [1] a fourfold increase since 1956. Between 1976 and 1986, an average annual population growth of almost 4% was reached, but due to decreasing fertility levels the growth decreased to 1.2% between 2011 and 2016.
RGR is a concept relevant in cases where the increase in a state variable over time is proportional to the value of that state variable at the beginning of a time period. In terms of differential equations, if is the current size, and its growth rate, then relative growth rate is. If the RGR is constant, i.e., a solution to this equation is.
where N is the biomass density, a is the maximum per-capita rate of change, and K is the carrying capacity of the population. The formula can be read as follows: the rate of change in the population (dN/dt) is equal to growth (aN) that is limited by carrying capacity (1 − N/K).
Net migration rates per 1,000 people. The net migration rate is the difference between the number of immigrants (people coming into an area) and the number of emigrants (people leaving an area) divided by the population. [1] When the number of immigrants is larger than the number of emigrants, a positive net migration rate occurs.
Since 2000, North Korea's birth rate has exceeded its death rate; the natural growth is positive. In terms of age structure, the population is dominated by the 15–64-year-old segment (68.09%). The median age of the population is 32.9 years, and the gender ratio is 0.95 males to 1.00 female.
During the past decades ethnic minorities have experienced higher growth rates than the majority Han population, because they are not under the one-child policy. Their proportion of the population in China has grown from 6.1% in 1953, to 8.04% in 1990, 8.41% in 2000, and 8.49% in 2010.
The Euler–Lotka equation, derived and discussed below, is often attributed to either of its origins: Euler, who derived a special form in 1760, or Lotka, who derived a more general continuous version. The equation in discrete time is given by. where is the discrete growth rate, ℓ ( a) is the fraction of individuals surviving to age a and b ...