Year	US Dollars, Monthly Level
1991-01-01	11539793288.069500
1992-01-01	11166921170.199202
1993-01-01	12497922907.400700
1994-01-01	14693347693.825800
1995-01-01	15476639288.377900
1996-01-01	18168159560.344803
1997-01-01	21187854721.296200
1998-01-01	25766822242.009400
1999-01-01	28001443532.892200
2000-01-01	32224461087.054996
2001-01-01	34034101989.900000
2002-01-01	37996116140.082100
2003-01-01	47998395305.599000
2004-01-01	59906839141.891500
2005-01-01	65837389731.924200
2006-01-01	76542481820.918400
2007-01-01	95101292070.321000
2008-01-01	109150328233.595000
2009-01-01	77751716967.145600
2010-01-01	87360586857.720810
2011-01-01	101688549828.428000
2012-01-01	94496734658.642600
2013-01-01	99088762209.231110
2014-01-01	103729691027.629990
2015-01-01	90626954900.556100
2016-01-01	92260208541.888000
2017-01-01	104044155894.425000