That works out to about one set of twins for every 20 people. Historically the rate has been about one per 80 live births, though experts say that's rising globally, primarily in developed countries where fertility treatments are more readily available.
It's impossible to say what could be behind the high number of twins here, or whether there is any cause at all.
Scientists say a variety of factors play into twin births, such as race, the mother's age and diet. Western Africa, from where many Afro-Cubans can trace their ancestry, has significantly elevated rates of twinning.
