Bill Gates is the richest American for the 20th year in a row and has reclaimed the title of worlds richest person from Mexicos Carlos Slim with a net worth of $72 billion. Warren Buffett, again number two, was the years biggest dollar gainer, having added $12.5 billion to his fortune. Facebooks hot stock pumped up Mark Zuckerbergs fortune by $9.6 billion and put him back into the top 20 after missing the top cut last year; Carl Icahn lost his battle to stop Dell DELL 0% from going private but he had a great year and moves back in the top 20 for the first time since 2008. The biggest percentage gainer was Workdays David Duffield, whose fortune more than tripled to $6.4 billion, and just behind him in terms of percentage jumps was the entrepreneur Elon Musk, now worth $6.7 billion and ranked 61st.
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