Year	US Dollars, Monthly Level
1993-01-01	765859013.3227060
1994-01-01	1305088508.1370800
1995-01-01	1833679908.1511200
1996-01-01	2076644153.0781598
1997-01-01	2930853552.7223100
1998-01-01	3241630159.4469400
1999-01-01	2373191814.1191500
2000-01-01	3161614629.2488300
2001-01-01	3313168462.2177300
2002-01-01	3438730979.7092300
2003-01-01	4527901813.8651700
2004-01-01	5882639703.7560900
2005-01-01	7656824089.2051110
2006-01-01	9668415583.4400100
2007-01-01	11010793499.5411000
2008-01-01	12431316556.9139000
2009-01-01	9035658785.7592490
2010-01-01	11547784723.2399000
2011-01-01	16629476941.5041000
2012-01-01	16071959761.1357020
2013-01-01	16337465801.3608000
2014-01-01	16045387199.0814000
2015-01-01	12819551063.0775000
2016-01-01	13095040177.9409000
2017-01-01	14472602114.1166000