Year Dollars 1992-01-01 2165314 1997-01-01 3329139 2002-01-01 24354806 2003-01-01 31046847 2005-01-01 20318103 2006-01-01 30924826 2007-01-01 31666212 2008-01-01 24421556 2009-01-01 15660234 2010-01-01 19861632