what percentage of the population has identical twins
Twin The human twin birth rate in the United States, rose 76% from 1980 through 2009, from 18.9 to 33.3 per 1,000 births.[5]
Paris Peace Accords
My Ántonia
One-child policy Since there are no penalties for multiple births, it is believed that an increasing number of couples are turning to fertility medicines to induce the conception of twins. According to a 2006 China Daily report, the number of twins born per year was estimated to have doubled.[timeframe?][90]