It's no secret that men make up more of the world's wealthiest than woman. But data indicates the gap is getting even wider.
For every female billionaire, there are 8.4 male billionaires worldwide, according to Wealth-X's 2015 Billionaire Census released Monday. That's up from 8.1 in 2014.
Of the 148 new additions to the ultra-wealthy club last year, just eight were women.
The men of the group also hold more of the wealth at 88.6%, a slight increase from 87.2% in 2014.
The total number of billionaires in the world hit a record high last year. Their combined wealth also climbed to an all-time high of $7.7 trillion U.S.
To get into the exclusive club, fewer billionaires are relying on inheritances and are instead striking it rich on their own.
More than half of all current billionaires are self-made, either from successful businesses or lucrative investments.
But female billionaires are still far more likely to inherit their wealth than their male counterparts.
In 2015, 56% of female billionaires inherited their wealth. But, they are becoming more entrepreneurial -- a significant drop from 65.4% in 2014.
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