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In fact, because of the 163 million-per-year raw births after 1995, the time it took to reach the next 10 reached its fastest pace (only 12 years), as world population reached 6 billion people in 1999, when at the beginning of the decade, the reaching was designated for the year 2000, by most demographers.
These people aged 9 through 18 make up these births today, and are either from the late Generation Y group, or are in the Generation Z group.
In the 20th century, the world saw the biggest increase in its population in human history due to lessening of the mortality rate in many countries due to medical advances and massive increase in agricultural productivity attributed to the Green Revolution. In the last few centuries, the number of people living on Earth has increased many times over.
By the year 2000, there were 10 times as many people on Earth as there were 300 years ago.
net decrease in population over time), especially in Central and Eastern Europe (mainly due to low fertility rates) and Southern Africa (due to the high number of HIV-related deaths).
The United Nations did determine, and celebrate, the "Day of 5 billion" (July 11, 1987), and the "Day of 6 billion" (October 12, 1999). The "Day of 7 billion" has been targeted by the Census Bureau to be in February 2012.
The single largest ethnic group on the planet by far is Han Chinese, which represents 19.73% of the global population.
For comparison 6.06% of the planet's population is of full or partial Spanish ancestry, and on a wider scale 14.2% of earth's population is of Sub-Saharan descent (those identifying as 'Black') Before adding mortality rates, the 1990s saw the greatest number of raw births worldwide, especially in the years after 1995, despite the fact that the birth rate was not as high as in the 1960s.
In the long run, the future population growth of the world is difficult to predict and the UN and US Census Bureau give different estimates.
Birth rates are declining slightly on average, but vary greatly between developed countries (where birth rates are often at or below replacement levels), developing countries, and different ethnicities.