 The Population Reference Bureau offers an annual "World Population Data Sheet", which is a chart packed with data from 200 countries concerning important demographic and health variables, such as total population, fertility rates, infant mortality rates, HIV/AIDS prevalence, and contraceptive use.The PRB's online data allows users to search a database of hundreds of demographic, health, economic, and environmental variables for countries and regions all around the world, such as the Middle East, Latin America, and Sub-Saharan Africa.The database provides scholarly articles about an assortment of topics, ranging from noncommunicable diseases and nutrition to the labor force and family planning.