'The IMF’s gold reserves declined by 18.5 tonnes (595,000 ounces) in March on the heels of a 5.6 tonne sale of gold in February.While that figure appears small relative to the big plays in the futures and/or ETF markets, it represents a full year’s worth of global bullion coin sales by a leading mint. (presumably through market sales?)

From Nadler's commentary

http://www.kitco.com/ind/nadler/may042010.html