Year	US Dollars, Monthly Level
1970-01-01	73432881.71307210
1971-01-01	1050550999.39055000
1972-01-01	1343113446.00287000
1973-01-01	1562917475.89164000
1974-01-01	-3250824367.66711000
1975-01-01	1316002775.68824000
1976-01-01	-4284429258.76856000
1977-01-01	-2282483154.43310000
1978-01-01	528166672.82331896
1979-01-01	-2419019339.77601000
1980-01-01	-14293207344.77540000
1981-01-01	-9324729652.64275000
1982-01-01	-14245917374.94720000
1983-01-01	-6435916921.34426000
1984-01-01	-2838739698.28355000
1985-01-01	-2761638773.43361000
1986-01-01	37967693.77539040
1987-01-01	-5258353477.65125000
1988-01-01	-9098333480.21872000
1989-01-01	-10902707482.44230000
1990-01-01	-14640788108.59450000
1991-01-01	-11203276102.00590000
1992-01-01	-240390762.60460502
1993-01-01	3943746961.81481000
1994-01-01	4694556474.40064050
1995-01-01	12800765951.73130000
1996-01-01	10347497927.98779900
1997-01-01	17096546176.23969800
1998-01-01	12851522716.38180000
1999-01-01	9365488469.15321000
2000-01-01	-11428757638.39000000
2001-01-01	-5176373880.68279000
2002-01-01	2343305724.71664000
2003-01-01	-6389669038.68974000
2004-01-01	-18833039980.59610000
2005-01-01	-41066993140.34490000
2006-01-01	-46577669699.40350000
2007-01-01	-71171440340.15440000
2008-01-01	-99496720949.10420000
2009-01-01	-78065666768.55461000
2010-01-01	-86898037548.15900000
2011-01-01	-123344253891.96800000
2012-01-01	-105089263951.24400000
2013-01-01	-102224132984.95999000
2014-01-01	-96984703838.46179000
2015-01-01	-67110976399.94160500
2016-01-01	-70862223868.04900000
2017-01-01	-89668534243.98860000