Year	US Dollars, Monthly Level
1999-01-01	2350424147809.5800
2000-01-01	2450653147842.3000
2001-01-01	2470201061767.3000
2002-01-01	2636662079926.4600
2003-01-01	3152658794805.9000
2004-01-01	3743455582639.9800
2005-01-01	4069802366927.1900
2006-01-01	4610592335688.3010
2007-01-01	5366123750236.1200
2008-01-01	5899855690738.5900
2009-01-01	4589827391297.6500
2010-01-01	5155913673673.0290
2011-01-01	6079024655996.6600
2012-01-01	5818702266780.7100
2013-01-01	6081054745739.2000
2014-01-01	6155323485336.8010
2015-01-01	5382099009733.4795
2016-01-01	5367107206709.0800
2017-01-01	5898929299665.1300