Year	U.S. Dollars
2000-01-01	21473500000
2001-01-01	22066000000
2002-01-01	23141700000
2003-01-01	27454000000
2004-01-01	31184000000
2005-01-01	32272200000
2006-01-01	34376600000
2007-01-01	38909900000
2008-01-01	44839900000
2009-01-01	43623800000
2010-01-01	44054500000
2011-01-01	45809800000
2012-01-01	45044400000
2013-01-01	46253000000
2014-01-01	47605100000
2015-01-01	43155500000
2016-01-01	42073900000
2017-01-01	40275500000
2018-01-01	40297500000
2019-01-01	41956300000