Fertility rates in the United States dropped to their lowest level in recorded history, with women having an average of 1.7 births in their lifetime. That’s one of the key findings in PRB’s 2019 World Population Data Sheet.
(March 2008) The number of international migrants is at an all-time high. There were 191 million migrants in 2005, which means that 3 percent of the world's people left their country of birth or citizenship for a year or more.