Year	US Dollars
2000-01-01	16794000000
2001-01-01	9372800000
2002-01-01	3643500000
2003-01-01	7192600000
2004-01-01	9507700000
2005-01-01	23787000000
2006-01-01	38477400000
2007-01-01	20248900000
2008-01-01	22278300000
2009-01-01	7848600000
2010-01-01	12196100000
2011-01-01	44342800000
2012-01-01	73976300000
2013-01-01	74131800000
2014-01-01	54487700000
2015-01-01	17554900000
2016-01-01	4875000000
2017-01-01	17627200000
2018-01-01	21849100000
2019-01-01	21642900000