The United States is the richest nation, or at least one of the richest.
In 2003, fourteen countries (including the U.S.) gave an average of 0.41% of their GNI (gross national income, I think) to Development Assistance (for developing countries). the 0.41% saying that on average, each country gave 0.41% of just their GNI, not that the countries gave 0.41% of the combined GNI's.
0.41% - that doesn't seem like a whole lot to me.
And you know what else? Guess what country gave the least percentage? Why, the U.S. of course, with a whopping 0.13%. Way to be 0.28% below the average.
Website of the day - http://www.data.org