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- 18:03, 9 April 2010 S8600021 talk contribs uploaded File:USA triplet birth rate.jpg (Figure 10. Triplet/+ birth rates for mothers 25 years of age and older: United States, 1980, 1990, 1998, and 2006. The rate of triplet and higher order multiple births (triplet/+) declined 5 percent in 2006, to 153.3 per 100,000 total births, from 161.8 )