The world's richest person got even richer this year.
Forbes says that Bill Gates's net worth rose to $US79.2 billion ($A101.27 billion) in 2015 from $US76 billion last year.
That put him at the top of the magazine's list of the world's billionaires for the second consecutive year.
The co-founder of Microsoft Corp. has topped the list for 16 of the last 21 years.
In second place is telecom mogul Carlos Slim Helu, with a net worth of $US77.1 billion. He had topped the list in 2013.
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Next is investor Warren Buffett, who moved up one slot this year with a net worth of $US72.7 billion.
Forbes says there were 1826 billionaires on its list this year, up from 1645 in 2014.
It's the 29th year for Forbes billionaires' list.
