Year Dollars 1997-01-01 2703937 2002-01-01 4117197 2004-01-01 5892525 2006-01-01 6260346 2007-01-01 7065311 2008-01-01 8474227 2009-01-01 9134198 2010-01-01 5854283 2011-01-01 7965674 2012-01-01 5055480 2013-01-01 10325819 2014-01-01 12058229 2015-01-01 11685175 2016-01-01 16692221