Year	US Dollars, Monthly Level
1996-01-01	16626282262.769901
1997-01-01	17853777295.617200
1998-01-01	16293426472.172400
1999-01-01	17211190001.528500
2000-01-01	19232955819.940800
2001-01-01	18194425139.297302
2002-01-01	18173564391.454400
2003-01-01	21669210670.780197
2004-01-01	33089822824.869200
2005-01-01	41990982397.942000
2006-01-01	59226286434.858400
2007-01-01	68478553205.903100
2008-01-01	64406394626.554800
2009-01-01	55329205230.171295
2010-01-01	71190122577.718600
2011-01-01	81424719931.706800
2012-01-01	78097630247.120910
2013-01-01	76849414033.015090
2014-01-01	75022714499.171100
2015-01-01	62037313003.130200
2016-01-01	60692500178.994600
2017-01-01	69240331771.786800