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The world population will likely increase by 2.5 billion over the next 43 years, passing from the current 6.7 billion to 9.2 billion in 2050. The 2006 Revision is the twentieth round of official United Nations population estimates and projections, it builds on the 2004 Revision and incorporates the results both of the 2000 round of national population censuses and of recent specialized surveys carried around the world. These sources provide both demographic and other information to assess the progress made in achieving the internationally agreed development goals, including the Millennium Development Goals.
