Year	US Dollars, Monthly Level
1999-01-01	2338295711854.2500
2000-01-01	2505940694863.1400
2001-01-01	2474228802036.2100
2002-01-01	2596868481310.7300
2003-01-01	3133729743435.8300
2004-01-01	3747432164495.2300
2005-01-01	4145510458054.1600
2006-01-01	4777501541006.6490
2007-01-01	5572193569562.7100
2008-01-01	6194329960426.0205
2009-01-01	4696975841733.5290
2010-01-01	5297149506338.8910
2011-01-01	6224458469254.0100
2012-01-01	5874758503115.6410
2013-01-01	5926729826873.3700
2014-01-01	6037284910849.2500
2015-01-01	5230645073271.5000
2016-01-01	5252593422099.0400
2017-01-01	5801134126146.6700