Meet the Clydesdale. The Clydesdale breed once almost faced extinction. Even though there is little practical use for heavy horses today because their muscle power has been replaced by machinery, breeders and enthusiasts have ensured that the breed is increasing, rather diminishing in numbers.
1 Over the three decades, the twin birth rate rose by 76 percent, from 18.9 to 33.2 per 1,000 births (or from 1.9 percent to 3.3 percent of all births) (Figure 1). 2  Increases in the twin birth rate averaged more than 2 percent a year from 1980 through 2004 (peaking at more than 4 percent from 1995 to 1998).
They may be looking at the economy as a factor, but there also are a lot of policies and programs out there targeted at lessening teen births, he said. Experts were less pleased to note the twin birth rate reached a new high for the nation of 33.7 per 1,000 total births, up 2 percent from 2012.he general fertility rate also declined by about 1 percent in 2013 to 62.5 births per 1,000 women ages 15 to 44, reaching another record low for the United States, the report noted. But experts say that births are likely to pick up as the economy continues to improve.