Microsoft co-founder Bill Gates is back on top of the list of the world's richest people after a four-year hiatus.

Forbes magazine announced its ranking of the world's billionaires today.

Gates, who led the list for 15 of the past 20 years, won the spot back from a Mexican telecom mogul who had topped the list for the past four years.

Gates' net worth is estimated at $76 billion. Forbes says a record 1,645 billionaires made the list this year, with an average net worth of $4.7 billion. 

Check out the complete list of billionaires, here.