'worthy causes' and 'charitable givings' are different:
"Corporate contributions rose 22.5 percent to 13.77 billion, representing 5.3 percent of total giving in 2005. About $1.38 billion of corporate contributions are estimated to have been given for disaster relief.
In contrast, charitable bequests fell 5.5 percent to $17.44 billion, representing 6.7 percent of total giving in 2005."
Source: AFP > Resource Center | Fundraising news > Annual U.S. Charitable Giving Exceeds $260 Billion