Year	US Dollars
2000-01-01	13138800000
2001-01-01	6208100000
2002-01-01	4143600000
2003-01-01	2064800000
2004-01-01	2697300000
2005-01-01	14498100000
2006-01-01	19536900000
2007-01-01	31510400000
2008-01-01	20264900000
2009-01-01	8774500000
2010-01-01	20361100000
2011-01-01	60297000000
2012-01-01	23416000000
2013-01-01	26523000000
2014-01-01	13570700000
2015-01-01	1237400000
2016-01-01	16283100000
2017-01-01	18395300000
2018-01-01	29238500000
2019-01-01	26012600000