http://www.justgive.org/html/don_info/howmuch.html
Quote:
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Who Gives the Most? The people that give the most actually make the least. Households earning under $10,000 a year -- far below the poverty line -- gave 5.2% of their income to charity. That's a larger percentage of their money than any other income group.
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Here is one. I will find the other I was looking for.