Year Dollars 1992-01-01 16237119 1997-01-01 24206242 2002-01-01 23288022 2003-01-01 35077509 2004-01-01 31557878 2005-01-01 16427553 2006-01-01 17854535 2007-01-01 19613554 2008-01-01 21334397 2009-01-01 25310793 2010-01-01 14365041 2011-01-01 17047619 2012-01-01 12024167 2013-01-01 26045389 2014-01-01 31773814 2015-01-01 38389066 2016-01-01 70344934