The ranks of female billionaires continue to expand faster than those of male billionaires, according to a recent report.

There are now 233 women billionaires, an increase of 46% over the past five years to the end of 2018, according to a recent report from UBS and PwC, Pulse 2.0 writes. During that period, the number of male billionaires grew 39%, UBS and PwC found.

But the gender gap remains far more pronounced than in the majority of industries: female billionaires represented only 11% of the total around the world. The researchers analyzed a database of the 43 largest billionaire markets, which represent 2,101 billionaires or 98% of global billionaire wealth.

Nonetheless, growth in the number of female billionaires has been rising compared to male billionaires for some time.

In 2015, UBS and PwC found that the number of women billionaires grew by a factor of 6.6 between 1995 and 2014, while the number of men grew by a factor of 5.2, in what UBS called at the time the “‘Athena factor’ after the Greek goddess of wisdom, courage, and inspiration.”

Assets held by female billionaires grew by 26% to $871.2 billion, which the researchers attribute primarily to “progress in Asia.” At the end of last year, 57% of female billionaires in Asia-Pacific were entrepreneurs, according to the report.

Th share of female billionaires in Asia-Pacific, however, was only 8% in 2018, compared to 12% in North America, 13% in Central and South America and 18% in Western Europe, according to the report. And the $871.2 billion controlled by female billionaires is only a fraction of the $8.537 trillion that the researchers found was controlled by billionaires overall.