Year Dollars 1992-01-01 3174726 1997-01-01 9453461 2002-01-01 6069443 2003-01-01 4802762 2004-01-01 5545910 2005-01-01 7739610 2006-01-01 9414265 2007-01-01 18037653 2008-01-01 12617126 2009-01-01 7514070 2010-01-01 12330611 2011-01-01 9838827 2012-01-01 10572992 2013-01-01 10525799 2014-01-01 14987401 2015-01-01 17706290 2016-01-01 5416026