Year	U.S. Dollars
2000-01-01	17247800000
2001-01-01	17594700000
2002-01-01	19091200000
2003-01-01	19748600000
2004-01-01	21145500000
2005-01-01	21490000000
2006-01-01	22048700000
2007-01-01	24873500000
2008-01-01	29227500000
2009-01-01	35477300000
2010-01-01	38419600000
2011-01-01	40075700000
2012-01-01	43868600000
2013-01-01	46014200000
2014-01-01	47833400000
2015-01-01	49459300000
2016-01-01	49611000000
2017-01-01	51457300000
2018-01-01	53619600000
2019-01-01	56378700000