Release Notes: June 2011
The release of the IDB contains revised estimates and projections for 19 countries or areas incorporating new data or analysis. For general information about how these estimates and projections are developed, see Population Estimates and Projections Methodology. All projections have been produced by sex and single years of age up to 100 years and over.
- French Polynesia
- Sint Maarten
- United States
- Virgin Islands, British
* Denotes that a country has undergone additional analyses to update the estimated effects of HIV/AIDS. SeePopulation Estimates and Projections Incorporating AIDS.
Two new countries or areas are being added to the International Data Base with this update – Curacao and Sint Maarten – and one is being removed – Netherlands Antilles. The Netherlands Antilles dissolved on October 10, 2010. Curacao and Sint Maarten (the Dutch two-fifths of the island of Saint Martin) became autonomous territories of the Kingdom of the Netherlands. Bonaire, Saba, and Sint Eustatius now fall under the direct administration of the Netherlands.
Below is a brief summary of revisions for countries experiencing more than a 500,000 change from the previously estimated 2011 population.
The population of Angola in 2011 is estimated to be 4.2 million (31.5 percent) higher than in the previous update. This increase is due primarily to lower estimates of mortality and to higher estimates of fertility during the 1970s through 1990s.
The population of Azerbaijan in 2011 is estimated to be 1.0 million (12.2 percent) higher than in our previous update due to our assessment of undercounting in its censuses and lower estimates of net emigration for most of the period from 1989-2007.
The estimated 2011 population of Japan is 1.0 million (0.8 percent) higher than our previous estimate. This increase is due to the addition of newly available mortality data for 2005-2009 that indicate longer life expectancy than previously projected. In addition, newly available fertility data show higher fertility than previously estimated.
The population of Kazakhstan in 2011 is estimated to be 1.8 million (11.5 percent) higher than in our previous update due to our assessment of undercounting in its censuses and lower estimates of net emigration from 2001-2003 and a switch to net immigration starting in 2004.
The population of Kenya in 2011 is estimated to be 873 thousand (2.1 percent) higher than the previous update. This is primarily due to lower estimates of child mortality from 2004 onward.
The estimated 2011 population of Moldova is 620 thousand (14.4 percent) lower than the previous update. This decline is primarily due to considerably greater estimates of net emigration. In addition, higher estimates of child mortality (infant and age 1-4 mortality) from the early 1990s to the early 2000s, and a higher overall mortality rate starting in the early 2000s contributed to the lower population estimate.
The estimated 2011 population of Nigeria is 10.6 million (6.8 percent) higher than in the previous update. This increase is primarily due to the combined effect of higher fertility than previously estimated and a slower decline from these levels than previously expected. In addition, estimates of infant and child mortality from 2003 to 2008 are lower than previously estimated.
The estimated 2011 population of Qatar is 1 million (118.1 percent) higher than in the previous update due mainly to substantial increases in net migration to the country between 2004 and 2010.
Singapore's population in 2011 is estimated to be 506 thousand (10.7 percent) higher than in the previous update due mainly to higher estimates of net immigration between 2000 and 2010.
The population of the United States in 2011 is estimated to be 2.2 million (0.7 percent) lower than the previous update. This decline is primarily due to lower estimates of net migration to the country.