Year	US Dollars, Monthly Level
1989-01-01	4117437039.0000005
1990-01-01	4672633479.0000000
1991-01-01	4973151301.0000000
1992-01-01	4884331262.0000000
1993-01-01	5944757344.0000000
1994-01-01	8972069056.0000000
1995-01-01	13847581655.0000000
1996-01-01	14241892633.0000000
1997-01-01	15873546753.0000000
1998-01-01	16833271230.0000020
1999-01-01	15011350442.0000000
2000-01-01	14062404799.0000000
2001-01-01	14818513753.0000000
2002-01-01	13132698247.0000000
2003-01-01	12929312786.0000000
2004-01-01	15921695414.0000000
2005-01-01	18148638330.0000000
2006-01-01	20193817504.0000000
2007-01-01	26729208882.0000000
2008-01-01	36178697601.0000000
2009-01-01	29215971124.0000000
2010-01-01	39127437161.0000000
2011-01-01	46424069357.0000000
2012-01-01	47667100000.0000000
2013-01-01	50740569000.0000000
2014-01-01	46718410000.0000000
2015-01-01	36646219434.0000000