Year	US Dollars, Monthly Level
1960-01-01	-213690881.14625000
1961-01-01	-324400239.16339700
1962-01-01	-232837207.22735800
1963-01-01	-247767365.91436598
1964-01-01	-259885986.78908598
1965-01-01	-320965606.99929000
1966-01-01	-377363757.81105304
1967-01-01	-327243806.66551600
1968-01-01	-322812344.06430197
1969-01-01	-363696656.59947300
1970-01-01	-613125812.79683200
1971-01-01	-703837282.46176300
1972-01-01	-899282246.06240810
1973-01-01	-1050731393.51527000
1974-01-01	-2030877727.46982030
1975-01-01	-2085730500.83517980
1976-01-01	-2527491617.42320000
1977-01-01	-2992676367.76890000
1978-01-01	-2851943347.95379970
1979-01-01	-3210740999.66070000
1980-01-01	-4823855281.93162100
1981-01-01	-5723952924.99092000
1982-01-01	-5362412583.67039000
1983-01-01	-3548440937.92116000
1984-01-01	-2709734665.90550000
1985-01-01	-1955212767.26250980
1986-01-01	-2117791324.29184000
1987-01-01	-4131659352.80971050
1988-01-01	-5357765878.26573900
1989-01-01	-6099097052.45611000
1990-01-01	-8493425963.52111900
1991-01-01	-9788959078.80692100
1992-01-01	-11761728453.07160000
1993-01-01	-8650162570.29006000
1994-01-01	-9286935184.19810000
1995-01-01	-9983401711.71136000
1996-01-01	-10661152401.24480000
1997-01-01	-11191762286.01570100
1998-01-01	-13456228992.11699900
1999-01-01	-15352407418.54160100
2000-01-01	-15594748212.30910000
2001-01-01	-15379743748.36180100
2002-01-01	-14200070791.28480000
2003-01-01	-15531824798.47850000
2004-01-01	-19079914571.18490200
2005-01-01	-25214529527.33630000
2006-01-01	-25983647815.02580300
2007-01-01	-29496276309.21450000
2008-01-01	-37104905378.66120000
2009-01-01	-27264362953.35799800
2010-01-01	-28094407126.31450000
2011-01-01	-23358959194.44980000
2012-01-01	-14170452436.86439900
2013-01-01	-12828262365.40080000
2014-01-01	-14484238269.93120000
2015-01-01	-11768240783.28749800
2016-01-01	-12590658618.05310000
2017-01-01	-16297918025.63039800