Demographics of the world
According to the CIA - The World Factbook, the country with the highest birth rate currently is Niger at 51.26 births per 1000 people. The country with the lowest birth rate is Japan at 7.64 births per 1000 people. Hong Kong, a Special Administrative Region of China, is at 7.42 births per 1000 people. As compared to the 1950s, birth rate was at 36 births per 1000 in the 1950s, birth rate has declined by 16 births per 1000 people. In July 2011, the U.S. National Institutes of Health announced that the adolescent birth rate continues to decline.
Legitimacy (family law)
It is notable that traditionally-conservative Catholic countries in the EU now also have substantial proportions of nonmarital births, as of 2016 (except where otherwise stated): Portugal (52.8% ), Spain (45.9%), Austria (41.7%), Luxembourg (40.7%) Slovakia (40.2%), Ireland (36.5%), Malta (31.8%).
To a certain degree, religion (the religiosity of the population - see Religion in Europe) correlates with the proportion of nonmarital births (e.g., Greece, Cyprus, Croatia have a low percentage of births outside marriage), but this is not always the case: Portugal (52.8% in 2016) is among the most religious countries in Europe.