Year	US Dollars, Monthly Level
1993-01-01	841655630.1179659
1994-01-01	1657861730.1190900
1995-01-01	2539001754.8831997
1996-01-01	3203262775.6878200
1997-01-01	4421428489.4322405
1998-01-01	4784277978.5547905
1999-01-01	3413408889.2466800
2000-01-01	4239889633.4613705
2001-01-01	4305826675.9642310
2002-01-01	4822878028.8289590
2003-01-01	6475346235.1713000
2004-01-01	8272324501.3956790
2005-01-01	10195390801.5950000
2006-01-01	13437683015.5480000
2007-01-01	15689668939.2492000
2008-01-01	16061095970.6265000
2009-01-01	10133019898.0717980
2010-01-01	12223038016.9723990
2011-01-01	17391616489.2602000
2012-01-01	18095756036.7417000
2013-01-01	18467728503.6224980
2014-01-01	18288337950.0901000
2015-01-01	14528303107.8425000
2016-01-01	14935108359.7993000
2017-01-01	16603151724.9360000