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The notion of doubling time dates to interest on loans in Babylonian mathematics. Clay tablets from circa 2000 BCE include the exercise "Given an interest rate of 1/60 per month (no compounding), come the doubling time." This yields an annual interest rate of 12/60 = 20%, and hence a doubling time of 100% growth/20% growth per year = 5 years.
The doubling time (t d) of a population is the time required for the population to grow to twice its size. [24] We can calculate the doubling time of a geometric population using the equation: N t = λ t N 0 by exploiting our knowledge of the fact that the population (N) is twice its size (2N) after the doubling time. [20]
So currently, the timeframe for this map goes from the 2020 United States Census resident populations to the 2022 Vintage Population Estimates. This file should next be updated when the 2023 Vintage Population Estimates are released on the statewide level, currently expected to occur in December 2023. The timeframe of this map will then be ...
As the United States has grown in area and population, new states have been formed out of U.S. territories or the division of existing states. The population figures provided here reflect modern state boundaries. Shaded areas of the tables indicate census years when a territory or the part of another state had not yet been admitted as a new state.
Population growth is the increase in the number of people in a population or dispersed group. The global population has grown from 1 billion in 1800 to 8.2 billion in 2025. [ 3 ] Actual global human population growth amounts to around 70 million annually, or 0.85% per year.
The 2022 projections from the United Nations Population Division (chart #1) show that annual world population growth peaked at 2.3% per year in 1963, has since dropped to 0.9% in 2023, equivalent to about 74 million people each year, and could drop even further to minus 0.1% by 2100. [5]
For example, in microbiology, a population of cells undergoing exponential growth by mitosis replaces each cell by two daughter cells, so that = and is the population doubling time. If the population grows with exponential growth rate r {\displaystyle \textstyle r} , so the population size at time t {\displaystyle t} is given by
List of U.S. states and territories by population growth rate. 4 languages ...