Japan leads the world in offering paid leave for fathers, but few take advantage of it, according to a new report by UNICEF based on legal entitlements from 2016.

The report — called "Are the world's richest countries family-friendly?" — looks at the globe's most family-friendly high- and middle-income countries, and among other factors ranks nations by the amount of paid leave that fathers and mothers are entitled to receive.

"In Japan, the only country that offers at least six months at full pay for fathers, only 1 in 20 took paid leave in 2017," a press release said.