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'Forbes' 2016 richest list: Zuckerberg races up

In Forbes' 2016 billionaires list of the world's richest people, Facebook CEO Mark Zuckerberg moved up 10 places from last year to reach sixth spot becoming the biggest gainer, the business magazine said Tuesday.

Zuckerberg is among 1,810 billionaires whose names have appeared in updated list, with cumulative net worth of $6.48 trillion from $7.05 trillion last year, Forbes said.

Microsoft founder Bill Gates retained the top place as the world's richest person. According to Forbes, his estimated $75 billion net worth gave him the number one spot for the 17th time in the last 22 years.

Spanish clothing retailer Amancio Ortega, best known for the Zara fashion chain bagged the second place after moving up two spots. Famed business investor Warren Buffett retained third place in the ranking even though his net worth plummeted $11.9 billion to an estimated total of $60.8 billion.

Mexican telecom magnate and investor Carlos Slim Hel? occupied the fourth place after falling two spots from last year. Amazon CEO and founder Jeff Bezos reached fifth place from the 15th spot last year as his cumulative worth increased to $45.2 billion.

The new top ten include Larry Ellison, executive chairman of software giant Oracle ($43.6 billion); Michael Bloomberg, a former New York City mayor who heads the business information firm ($40 billion); and brothers Charles and David Koch ($39.6 billion), who head U.S. multinational corporation Koch Industries.

The world's youngest billionaires are Norwegian heiresses Alexandra Andresen, 19, and her sister, Katharina Andresen, 20 with an estimated worth of $1.2 billion.