Year	US Dollars, Monthly Level
1966-01-01	3584642062.4132400
1967-01-01	3462678122.2883200
1968-01-01	3519181928.8811097
1969-01-01	4229436503.8091497
1970-01-01	4741543169.7226800
1971-01-01	5003377106.8094400
1972-01-01	6820878873.2832200
1973-01-01	9711264911.8822500
1974-01-01	15436535952.5955000
1975-01-01	16243567413.1990000
1976-01-01	17431414373.7909000
1977-01-01	17784337705.6423000
1978-01-01	18669099772.1499980
1979-01-01	25396711916.6197000
1980-01-01	33682379396.4194000
1981-01-01	32411653392.1573000
1982-01-01	31584585606.7860000
1983-01-01	29275088857.5760000
1984-01-01	28820945196.0223000
1985-01-01	30373209190.4580000
1986-01-01	35557081867.1425000
1987-01-01	48815325257.5551000
1988-01-01	59975858554.9588000
1989-01-01	70381281301.0644000
1990-01-01	86973419272.1109000
1991-01-01	92629346685.5425000
1992-01-01	100052547032.2590000
1993-01-01	80505402434.8502000
1994-01-01	93299605837.0034000
1995-01-01	116740883880.6980000
1996-01-01	124819165441.2670000
1997-01-01	115360513848.6150000
1998-01-01	135586262758.7960000
1999-01-01	134748648822.5630200
2000-01-01	156700557626.2850000
2001-01-01	154967242780.1100200
2002-01-01	164926356565.0980000
2003-01-01	207970235728.0520000
2004-01-01	256981608903.0110200
2005-01-01	288682955462.9110000
2006-01-01	331278062050.2890000
2007-01-01	390924000303.5570000
2008-01-01	418896108844.2070000
2009-01-01	293039472313.9140000
2010-01-01	326528570905.2730000
2011-01-01	376398303740.8510000
2012-01-01	339055814525.4800000
2013-01-01	340299839512.4760000
2014-01-01	357847427613.6440400
2015-01-01	311151941809.4159500
2016-01-01	311132616933.5400400
2017-01-01	353205648527.4960300