Year	US Dollars, Monthly Level
1966-01-01	-2338245124.8148103
1967-01-01	-2073300193.9722803
1968-01-01	-1931285285.2745800
1969-01-01	-2333547480.4826202
1970-01-01	-2348257311.6228300
1971-01-01	-2041412410.6840800
1972-01-01	-3008562191.8775600
1973-01-01	-4427176236.3821800
1974-01-01	-8339869024.0241190
1975-01-01	-8620101554.7965010
1976-01-01	-8755631365.3228400
1977-01-01	-7561105435.8114800
1978-01-01	-5609125999.7900800
1979-01-01	-7215717703.0286500
1980-01-01	-13430010888.1518000
1981-01-01	-11988338519.7930010
1982-01-01	-11145529914.8888000
1983-01-01	-9432258740.7256400
1984-01-01	-5154369040.3041800
1985-01-01	-5822993409.0341500
1986-01-01	-7924914761.5069600
1987-01-01	-14459914806.1483000
1988-01-01	-19767689359.5160030
1989-01-01	-26869159462.8621000
1990-01-01	-31394916523.4351000
1991-01-01	-32790730061.4212000
1992-01-01	-35569202451.0485000
1993-01-01	-19617749599.3171000
1994-01-01	-19757143465.6542970
1995-01-01	-16240714461.2128010
1996-01-01	-14341482766.5185000
1997-01-01	-14666539701.4253000
1998-01-01	-24329190680.2814980
1999-01-01	-31042565243.1902000
2000-01-01	-41301688609.2085950
2001-01-01	-37878400880.9770000
2002-01-01	-39336133767.4421000
2003-01-01	-52435640256.8379000
2004-01-01	-75442365137.2070000
2005-01-01	-96440625897.0648000
2006-01-01	-115627992161.9670000
2007-01-01	-136093748486.6480000
2008-01-01	-137558083771.0440000
2009-01-01	-65584012539.3940000
2010-01-01	-72642832729.1768000
2011-01-01	-69981488353.1224000
2012-01-01	-41421777319.2347000
2013-01-01	-22003918128.8044000
2014-01-01	-33644372415.9872970
2015-01-01	-29027180966.2037000
2016-01-01	-21177033291.0910000
2017-01-01	-31322821884.2706000