The World Bank
The World Bank is based in Washington, DC. With financial and technical funds, it supports developing countries worldwide. Its focus is the sustainable fight against poverty by further training and advisory activities. The World Bank has got 188 members and consists of five institutions. It obtains its data on the population from the United Nations. As not all governments regularly present (accurate) data, the United Nations base their estimates on the latest official census, taking birth- and death rates as well as international migration into account.