Year	US Dollars, Monthly Level
1999-01-01	12318858208.903600
2000-01-01	11862663930.680601
2001-01-01	11296158029.605700
2002-01-01	11629792600.249401
2003-01-01	14170534988.784100
2004-01-01	17558185723.411602
2005-01-01	20179318845.636600
2006-01-01	24222187402.237200
2007-01-01	31876423497.646700
2008-01-01	37260270016.490900
2009-01-01	26400137323.852300
2010-01-01	29809407531.827600
2011-01-01	35420499357.818596
2012-01-01	32367056709.393303
2013-01-01	33584893879.982600
2014-01-01	33976147619.728302
2015-01-01	29645767901.431700
2016-01-01	30545747935.478800
2017-01-01	36220717883.330600