Year	US Dollars, Monthly Level
1980-01-01	15570601866.123299
1981-01-01	20003586348.599900
1982-01-01	21270127090.450400
1983-01-01	22398708968.844597
1984-01-01	24156285969.685700
1985-01-01	21629058680.431300
1986-01-01	16136804837.783500
1987-01-01	20519592320.896202
1988-01-01	20543099661.278600
1989-01-01	22904936232.022000
1990-01-01	26807948123.488900
1991-01-01	42546545939.571800
1992-01-01	46112843693.016106
1993-01-01	51779565867.298200
1994-01-01	60835168492.572105
1995-01-01	79478245350.407410
1996-01-01	95504579372.288900
1997-01-01	110212380621.711000
1998-01-01	117415183707.131010
1999-01-01	135995384587.896010
2000-01-01	166060981738.287020
2001-01-01	158911041169.216000
2002-01-01	160642703817.595980
2003-01-01	164831844445.595000
2004-01-01	187279292355.723000
2005-01-01	214300201574.121000
2006-01-01	250050822443.969000
2007-01-01	271595662774.224030
2008-01-01	289888787828.451000
2009-01-01	229524277299.767970
2010-01-01	297873672020.256000
2011-01-01	349804775062.604000
2012-01-01	370344655048.700000
2013-01-01	378972420643.592000
2014-01-01	396165373577.798000
2015-01-01	380757619117.231000
2016-01-01	373530256018.155000
2017-01-01	409827912682.881000