Chart created by Erin Osborne.
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On June 25, 2006, Warren Buffett (the CEO of Berkshire Hathaway and then the richest man in the world) began giving away his billions to the Bill and Melinda Gates Foundation: http://money.cnn.com/2006/06/25/magazines/fortune/charity1.fortune/
On July 8, 2013, Warren Buffett gave another $2 Billion to the Bill and Melinda Gates Foundation: http://dealbook.nytimes.com/2013/07/08/buffett-gives-2-billion-to-gates-foundation/?_php=true&_type=blogs&_r=0