For our 30th annual guide to the richest people on earth, we found a total of 1,810 billionaires, down from 1,826 a year ago. Their aggregate net worth: $6.5 trillion, $570 billion less than last year. Behind the top-line figures is a story of huge upheaval, as 221 people fell off the list while 198 newcomers joined it. Blame cratering oil prices, volatile global stock markets and a stronger dollar.
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