Year	Dollars
1992-01-01	5088955240
1997-01-01	10782236081
2002-01-01	13834292394
2003-01-01	15351369167
2004-01-01	13656940043
2005-01-01	14620438555
2006-01-01	16222468165
2007-01-01	17987453269
2008-01-01	17750273007
2009-01-01	12394608619
2010-01-01	15101901838
2011-01-01	16450617105
2012-01-01	17143006272
2013-01-01	17357948246
2014-01-01	18028530675
2015-01-01	17906994234
2016-01-01	16722716573