Year	US Dollars, Monthly Level
1960-01-01	10185250695.800300
1961-01-01	11054121742.663600
1962-01-01	12430546581.338400
1963-01-01	13198420667.798600
1964-01-01	14785323675.377200
1965-01-01	17552937100.230602
1966-01-01	18106570144.874500
1967-01-01	17592495272.800800
1968-01-01	20411576193.792800
1969-01-01	25113821918.976100
1970-01-01	30109219584.943900
1971-01-01	34456304346.079000
1972-01-01	40294894240.274300
1973-01-01	55055170570.279400
1974-01-01	70095336753.749000
1975-01-01	75211659471.794400
1976-01-01	87741206016.026400
1977-01-01	100943452514.556990
1978-01-01	121488239837.257000
1979-01-01	160295575632.001980
1980-01-01	188323417082.350000
1981-01-01	164141001022.262000
1982-01-01	155077196113.202000
1983-01-01	152133831677.245030
1984-01-01	153215890122.514000
1985-01-01	159970081316.442000
1986-01-01	191907265523.231000
1987-01-01	228763013751.086000
1988-01-01	248821138098.393980
1989-01-01	269411841481.253020
1990-01-01	349625634848.183000
1991-01-01	393013311297.857000
1992-01-01	406942115123.209960
1993-01-01	345211437443.878050
1994-01-01	384028906046.725040
1995-01-01	463731212870.193000
1996-01-01	459587997466.006960
1997-01-01	446436243753.312000
1998-01-01	470300111158.248000
1999-01-01	470361003166.558960
2000-01-01	494356912866.059000
2001-01-01	486339910623.927000
2002-01-01	490347701397.563960
2003-01-01	604472980267.784000
2004-01-01	710281982529.605000
2005-01-01	770565083503.423000
2006-01-01	905499309300.466100
2007-01-01	1056500298750.350100
2008-01-01	1181933741026.690200
2009-01-01	921771810977.730000
2010-01-01	1046891038787.530000
2011-01-01	1246818557615.130000
2012-01-01	1155631340137.600000
2013-01-01	1180882322307.190000
2014-01-01	1206426466247.730200
2015-01-01	1046645334093.899900
2016-01-01	1049385593959.860000
2017-01-01	1163995216073.210000