Year Dollars 1992-01-01 169399 1997-01-01 3866713 2003-01-01 1152532 2006-01-01 3015229 2008-01-01 2236173 2009-01-01 3005033 2010-01-01 15274297 2011-01-01 3590290 2012-01-01 6463854 2015-01-01 9319907