Year	U.S. Dollars
2002-01-01	4366900000
2003-01-01	4552800000
2004-01-01	5145500000
2005-01-01	6166700000
2006-01-01	6925300000
2007-01-01	8555700000
2008-01-01	10296800000
2009-01-01	12066100000
2010-01-01	15325400000
2011-01-01	17890000000
2012-01-01	20293400000
2013-01-01	20169700000
2014-01-01	20615700000
2015-01-01	20079400000
2016-01-01	19454200000
2017-01-01	20888800000
2018-01-01	21657100000
2019-01-01	22925300000