Unfortunately I don't think that data is available. But from what I understand it has led to more giving. See this article - http://fortune.com/2010/06/16/the-6

Unfortunately I don't think that data is available. But from what I understand it has led to more giving. See this article - http://fortune.com/2010/06/16/the-600-billion-challenge/ http://fortune.com/2010/06/16/the-600-billion-challenge/