The series proved unpopular in everyday commerce. Mintage dropped by 90% the following year. From 2002 through 2008, Sacagawea dollars were only struck for sale to collectors. The Federal Reserve Bank ordered none of the Native American series after their issuance beginning in 2009. In December 2009, it was noted by a Federal Reserve official that there were currently 857,000,000 dollar coins (including Presidential dollars) in government storage vaults, an amount estimated to satisfy the demand for twelve years. In 2009, with the introduction of the Native American reverse designs, the coins were re-introduced to circulation; however, they again proved unpopular in commerce and following the 2011 issue, treasury secretary Timothy F. Geithner announced that all future dollar coin production would be for numismatic (collecting) purposes only.