Year	U.S. Dollars
2000-01-01	3538800000
2001-01-01	3781800000
2002-01-01	4544400000
2003-01-01	4829900000
2004-01-01	5998600000
2005-01-01	6713600000
2006-01-01	8201300000
2007-01-01	9387700000
2008-01-01	12711900000
2009-01-01	11076800000
2010-01-01	12769600000
2011-01-01	13763300000
2012-01-01	14327600000
2013-01-01	14247900000
2014-01-01	15546800000
2015-01-01	14117700000
2016-01-01	13592800000
2017-01-01	14188900000
2018-01-01	14839600000
2019-01-01	15712900000