The World’s Billionaires, Forbes 2007: “Forbes pinned down 946 billionaires, including 178 newcomers and 17 people who climbed back into the ranks after being absent for a year or more. Two-thirds of last year’s billionaires are richer. Only 17% are poorer, including 32 who fell below the billion-dollar mark. The billionaires’ combined net worth climbed by $900 billion to $3.5 trillion. That equates to $3.6 billion apiece.”