From about 1915, when the statistical record begins, until 1980, about one in every 50 babies born was a twin, a rate of 2 percent.
Then, the rate began to increase: by 1995, it was 2.5 percent. The rate surpassed 3 percent in 2001 and hit 3.3 percent in 2010. Now, one out of every 30 babies born is a twin.
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