The US spends $10 billion annually (0.1% of national income ranking it the lowest of 22 nations)
"At stake is some $50 billion a year, primarily from 22 donor nations, which supplements loans by the World Bank to promote development. That figure represents less than 0.2 percent of the donors' collective gross national income, down from 0.3 percent 10 years ago. (The United States spends about $10 billion annually, or 0.1 percent of its national income, ranking it the lowest of the 22 nations.)" "William Easterly, a former economist at the World Bank, said that despite $1 trillion in loans since the 1960's, the per-capita growth rate of the typical developing country over the past 20 years was zero."
Source: Weinstein, Michael M. "Ideas & Trends; The Aid Debate: Helping Hand, or Hardly Helping?" New York Times. May 26, 2002. http://www.nytimes.com/2002/05/26/weekinreview/ideas-trends-the-aid-deba...