Carlos Slim Helu, a Mexican telecom tycoon, has surpassed Bill Gates as the richest person in the world according to Forbes' annual list of the twenty richest people. Slim Helu's net worth increased to $53.5 billion, $18 billion more than the previous year. While Americans still make up 40% of the world's billionaires, this is down from 45% in the previous year, showing that they are gradually losing their dominance at the top of the list. Bill Gates had held the top spot for fourteen of the past fifteen years.