The World Statistics Pocketbook 2011 is the thirty-first in a series of annual compilations of key statistical indicators prepared by the United Nations Statistics Division of the Department of Economic and Social Affairs. Over 50 indicators have been collected from more than 20 international statistical sources and are presented in one-page profiles for 216 countries or areas of the world. This issue covers various years from 2000 to 2011. For the economic indicators, in general, three years - 2000, 2005 and 2010 - are shown; for the indicators in the social and environmental categories, data for one year are presented.