Some critics charge that U.S. government aid should be higher given the high levels of gross domestic product. They claim other countries give more money on a per capita basis, including both government and charitable contributions. By one index which ranked charitable giving as a percentage of GDP, the U.S. ranked 21 of 22 OECD countries by giving 0.17% of GDP to overseas aid, and compared the U.S. to Sweden which gave 1.03% of its GDP, according to different estimates.[78][79] The U.S. pledged 0.7% of GDP at a global conference in Mexico.[80] According to one estimate, U.S. overseas aid fell 16% from 2005 to 2006.[81]