Birth rate
According to the CIA's "The World Factbook", the country with the highest birth rate is Niger at 6.49 children born per woman and the country with the lowest birth rate is Taiwan, at 1.13 children born per woman.
Cohabitation in the United Kingdom
There are differences in extramarital births by region; in 2012, the highest percentage of births to unmarried women were in North East of England at 59%, and in Wales at 58%; and the lowest in London (36%) and in Northern Ireland (42%). One of the reasons cited for the lower percentage of extramarital births in London is the high number of immigrants from conservative world regions who reside in the city. Younger mothers are more likely to be unmarried: in 2011, 96% of mothers aged under 20 were unmarried, compared to only 31% of mothers in their 30s. A study dealing with births that occurred in the year 2000 found several social and personal characteristics of cohabiting vs. married parents: married mothers are most likely to be Asian and least likely Black Caribbean; married mothers are more religious; married mothers and fathers are more educated (they are more than twice as likely to have a degree than cohabiting parents); married fathers are twice as likely to have a professional occupation as cohabiting fathers; married parents have a better financial situation; married mothers are older and are more likely to have had the birth planned. A 2006 study found that cohabiting couples, with and without children, are the fastest-growing family type in the UK. Cohabiting couples who live with their children are more common in the North of England than in the South.