Gates back on top of 'Billionaires List'

Bill Gates

Microsoft founder Bill Gates is back on top of the Forbes' List of the Top 50 billionaires.

Gates' fortune rose by $9 billion dollars in the past year, making his total worth $76-billion.

Mexican telecom mogul Carlos Slim Helu, who held the top spot for the last four years, is number two

Facebook's Mark Zuckerberg makes the list at number 21, but he had the biggest dollar gain, with his fortune jumping $15 billion in the last year, to $28.5 billion.

To view the Forbes Billionaires List