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With one of the world's lowest birth rates, Taiwan faces the prospect of a rapidly aging population without a young workforce to support it.

There is a strong correlation between the rate of birth and the number of babies born out of wedlock.

One is the sheer size of that particular group. As birth rates have come down, subsequent generations have turned out to be a lot smaller.

France is one of three EU countries with a fertility rate above the magic replacement level (Denmark and Ireland are the others).

While it shows the U. S. population is more than replacing itself, a healthy trend, the teen birth rate was up for a second year in a row.

However, there has hardly been a year since 1957 in which birth rate have not fallen in the Untied States and other rich countries.

But Serbia has one of the oldest populations in Europe and a low fertility rate, so the population is shrinking by 30, 000 a year.

America's economy grew more quickly partly because its population rose by almost 1% a year, thanks to immigration and a higher birth rate.

Fertility rates tend to drop with economic development. China's is still above that of Britain and many European countries.