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The wealth of the world's billionaires rose by $1.4 trillion in 2017, the largest annual increase ever.
The details: Nearly all of that increase was driven by the Asia-Pacific region, and specifically China, where billionaire wealth rose 39%. The region minted three new billionaires a week over the course of the year. 701 billionaires are over the age of 70, accounting for nearly 40% of the wealth in the chart above.