Year	US Dollars, Monthly Level
1991-01-01	74447687495.30609
1992-01-01	64236995125.49790
1993-01-01	45783460517.92520
1994-01-01	50909325769.65050
1995-01-01	61088898413.06450
1996-01-01	69223203269.73160
1997-01-01	71755636122.14040
1998-01-01	58639626753.17100
1999-01-01	37223832999.47510
2000-01-01	42074146322.36680
2001-01-01	51066269677.22110
2002-01-01	58211161677.21080
2003-01-01	72950420032.18390
2004-01-01	93467561064.25821
2005-01-01	122953796082.60700
2006-01-01	161490266824.26200
2007-01-01	221074837367.15500
2008-01-01	287822406802.08400
2009-01-01	182674472685.59900
2010-01-01	242871409845.94400
2011-01-01	317526331487.55400
2012-01-01	335594986774.05800
2013-01-01	341904801349.61500
2014-01-01	309189369880.62897
2015-01-01	193305605674.02402
2016-01-01	190488316715.12802
2017-01-01	237738722080.31700