Year	US Dollars, Monthly Level
1980-01-01	19941900000.00000
1981-01-01	24954700000.00000
1982-01-01	15036500000.00000
1983-01-01	9025400000.00000
1984-01-01	12167200000.00000
1985-01-01	14533100000.00000
1986-01-01	12432500000.00000
1987-01-01	13305400000.00000
1988-01-01	20273700000.00000
1989-01-01	25437900000.00000
1990-01-01	31271900000.00000
1991-01-01	49966560000.00000
1992-01-01	62129350000.00000
1993-01-01	65366541999.99999
1994-01-01	79345901000.00000
1995-01-01	72453067000.00000
1996-01-01	89468766000.00000
1997-01-01	109808200000.00000
1998-01-01	125373058000.00000
1999-01-01	141974764000.00000
2000-01-01	174457823000.00000
2001-01-01	168396434000.00000
2002-01-01	168678889000.00000
2003-01-01	170545844000.00000
2004-01-01	196809652000.00000
2005-01-01	221819526000.00000
2006-01-01	256058352000.00000
2007-01-01	281949049000.00000
2008-01-01	308603251000.00000
2009-01-01	234384972000.00000
2010-01-01	301481819000.00000
2011-01-01	350842876000.00000
2012-01-01	370751559000.00000
2013-01-01	381210168000.00000
2014-01-01	399977208000.00000
2015-01-01	395232369000.00000
2016-01-01	387064499000.00000
2017-01-01	420369151000.00000