According to IMF’s Currency Composition of Official Foreign Exchange Reserves (COFER) database, US dollar remains the preferred reserve currency. In the fourth quarter of 2011, the dollar made up 62.1% of official reserves. The dollar accounted for 61.4% of official reserves in 2011 vs. 61.8% in 2010 and 62% in 2009.

See the chart below.

(graph courtesy of Northern Trust)