Here's a start
From Global Issues.org
Side note on private contributions
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As an aside, it should be emphasized that the above figures are comparing government spending. Such spending has been agreed at international level and is spread over a number of priorities.
Individual/private donations may be targeted in many ways. However, even though the charts above do show US aid to be poor (in percentage terms) compared to the rest, the generosity of the American people is far more impressive than their government. Private aid/donation has been through charity of individual people and organizations though this of course can be weighted to certain interests and areas. Nonetheless, it is interesting to note for example, per latest estimates, Americans privately give at least $34 billion overseas — more than twice the US official foreign aid of $15 billion at that time:
International giving by US foundations: $1.5 billion per year
Charitable giving by US businesses: $2.8 billion annually
American NGOs: $6.6 billion in grants, goods and volunteers.
Religious overseas ministries: $3.4 billion, including health care, literacy training, relief and development.
US colleges scholarships to foreign students: $1.3 billion
Personal remittances from the US to developing countries: $18 billion in 2000
Source: Dr. Carol Adelman, Aid and Comfort, Tech Central Station, 21 August 2002.
While Adelman admits that “there are no complete figures for international private giving†she still says that Americans are “clearly the most generous on earth in public — but especially in private — givingâ€. Hence these numbers and claims may be taken with caution, but even then, these are high numbers.
Now, not all of the 18 billion from personal remittances and not all of the 3.4 billion from Religious ministries will be Christians but I'll bet it's more than other countries since Japan the next highest to the US is at 9 billion and especially if you knew how many foundations and businesses were Christian.