Year	U.S. Dollars
2000-01-01	4480800000
2001-01-01	4064800000
2002-01-01	3813000000
2003-01-01	4119000000
2004-01-01	4329200000
2005-01-01	4831800000
2006-01-01	4910100000
2007-01-01	5505800000
2008-01-01	6640100000
2009-01-01	7211800000
2010-01-01	8880000000
2011-01-01	10434700000
2012-01-01	11235100000
2013-01-01	12419400000
2014-01-01	12697000000
2015-01-01	12712500000
2016-01-01	13551200000
2017-01-01	15013800000
2018-01-01	16142800000
2019-01-01	16853300000