This is a reduction of 8.2%.Indeed, total births in the USA peaked at 4,316,000 in 2007, before dropping in the last four years. Recently released provisional birth data by the CDC (Center for Disease Control) show that births in 2011 are preliminarily estimated to be 3,961,000, the lowest figure since 1999.
Looking at the previous peaks in numbers of births, the years where the reductions are closest to 8.2% are:
1961 4,268,326 peak not exceeded until 2007
1964 4,027,490 down 5.6%
1965 3,760,358 down 11.9%
1921 3,055,000 peak not exceeded until 1947
1926 2,839,000 down 7.1%
1927 2,802,000 down 8.3%
This data is taken from a printout of the table:
Table 1-1 Live Births, Birth Rates, and Fertility Rates, by Race: United States, 1909-99
One small detail. Regarding whether the absolute peak was 1957 or 1961, the 1957 births were adjusted to 4,300,000 in the table due to underregistration. I used the unadjusted numbers, which shows the peak to be 1961, but in any case they are very close.
Part of the point in showing this is that there is nothing abnormal in the recent reductions in US births compared to previous cycles. On the other hand, the failure of US births to exceed the previous peak in 1961 by a wide margin is unprecedented.
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