Year	US Dollars, Monthly Level
1991-01-01	10302322452.698500
1992-01-01	10923870612.164400
1993-01-01	9042486661.752550
1994-01-01	10823538479.411001
1995-01-01	13039638667.642000
1996-01-01	15912636482.610100
1997-01-01	19205364450.213200
1998-01-01	23258061688.872800
1999-01-01	25268292484.698200
2000-01-01	28546946082.447400
2001-01-01	31198600618.523700
2002-01-01	35031240826.227600
2003-01-01	43652920362.107800
2004-01-01	55753478146.447500
2005-01-01	62853675546.813600
2006-01-01	74834546458.360610
2007-01-01	95900921518.619100
2008-01-01	109590973970.638990
2009-01-01	83854990530.381900
2010-01-01	94672408649.875200
2011-01-01	111576185694.129000
2012-01-01	103020688889.045000
2013-01-01	107811837526.316000
2014-01-01	112091107232.806000
2015-01-01	100138551234.597000
2016-01-01	103030615520.538010
2017-01-01	113881635471.123000