Year	U.S. Dollars
2000-01-01	4709500000
2001-01-01	8677200000
2002-01-01	10352800000
2003-01-01	14141700000
2004-01-01	16641800000
2005-01-01	16460700000
2006-01-01	20814200000
2007-01-01	24715500000
2008-01-01	22764100000
2009-01-01	23579100000
2010-01-01	23712800000
2011-01-01	20198200000
2012-01-01	17138200000
2013-01-01	18795700000
2014-01-01	20267200000
2015-01-01	22751200000
2016-01-01	25105600000
2017-01-01	26220700000
2018-01-01	28942100000
2019-01-01	30718200000