Year	US Dollars, Monthly Level
1991-01-01	65610795108.952700
1992-01-01	54630406597.079895
1993-01-01	57087504203.588600
1994-01-01	67541799999.999990
1995-01-01	81096100000.000000
1996-01-01	88599000000.000000
1997-01-01	85945000000.000000
1998-01-01	73742000000.000000
1999-01-01	69656000000.000000
2000-01-01	99220000000.000000
2001-01-01	96555000000.000000
2002-01-01	102068000000.000000
2003-01-01	129060000000.000000
2004-01-01	177860000000.000000
2005-01-01	240025000000.000000
2006-01-01	297483000000.000000
2007-01-01	346530000000.000000
2008-01-01	466299000000.000000
2009-01-01	297155000000.000000
2010-01-01	392674000000.000000
2011-01-01	515408000000.000000
2012-01-01	527433000000.000000
2013-01-01	521836000000.000000
2014-01-01	496807000000.000000
2015-01-01	341419000000.000000
2016-01-01	281710000000.000000
2017-01-01	353548000000.000000