Year	US Dollars, Monthly Level
1990-01-01	25579851296.384502
1991-01-01	29152183323.366400
1992-01-01	33865924362.066303
1993-01-01	36833309909.821400
1994-01-01	39962066209.568800
1995-01-01	45349615081.959900
1996-01-01	49758043467.113700
1997-01-01	53433460896.628395
1998-01-01	48900212656.165000
1999-01-01	48528189953.461700
2000-01-01	62081963765.203600
2001-01-01	56439060240.720604
2002-01-01	57103864089.123200
2003-01-01	61113489788.751205
2004-01-01	71392615828.753190
2005-01-01	85549036004.609200
2006-01-01	100684960868.317000
2007-01-01	113946366122.599990
2008-01-01	137146211216.104000
2009-01-01	116005729231.902000
2010-01-01	157880168170.816000
2011-01-01	202257359586.534000
2012-01-01	190970833595.761020
2013-01-01	182065770017.843000
2014-01-01	175848211005.965000
2015-01-01	150444681750.130000
2016-01-01	145372718389.535000
2017-01-01	168512722082.074980