Year	US Dollars, Monthly Level
1960-01-01	-2445319407.0889200
1961-01-01	-1691096139.6375499
1962-01-01	-1588034899.2010100
1963-01-01	-1756229693.3696700
1964-01-01	-3041701885.3061204
1965-01-01	-2377043767.1818700
1966-01-01	-1908636755.8637002
1967-01-01	-3272447116.9310000
1968-01-01	-3474722057.3141600
1969-01-01	-2323113919.4698000
1970-01-01	-3283542128.5198197
1971-01-01	-2572125248.3339200
1972-01-01	-4373227706.4910800
1973-01-01	-9900868530.9416800
1974-01-01	-17279759064.5520000
1975-01-01	-11131513681.2818010
1976-01-01	-11935410427.8273000
1977-01-01	-8915579878.0350990
1978-01-01	-9000137786.2396900
1979-01-01	-14589676144.7363000
1980-01-01	-5339152735.0363400
1981-01-01	-1558951121.9632902
1982-01-01	-3383846113.7156400
1983-01-01	-7793075333.4053910
1984-01-01	-10874859471.5255000
1985-01-01	-8892405117.8703200
1986-01-01	-19050695634.8218000
1987-01-01	-24179872545.5416000
1988-01-01	-43566360890.9539000
1989-01-01	-46391891547.0374100
1990-01-01	-39796703657.0927000
1991-01-01	-25072608181.7509000
1992-01-01	-29811999278.0837020
1993-01-01	-25546143834.9824000
1994-01-01	-22597025496.8017000
1995-01-01	-23523546758.5317000
1996-01-01	-25470996080.6183970
1997-01-01	-26596924935.2546000
1998-01-01	-43887979003.5694000
1999-01-01	-50368364486.6450000
2000-01-01	-52290041296.2880000
2001-01-01	-53213764715.3568040
2002-01-01	-59699063301.8194000
2003-01-01	-77891209634.3421000
2004-01-01	-111252816463.8350000
2005-01-01	-107011516864.3680100
2006-01-01	-109963557799.7570000
2007-01-01	-181279585030.9840000
2008-01-01	-174431381693.8380000
2009-01-01	-128351333379.4170000
2010-01-01	-153290841637.7760000
2011-01-01	-162813757294.1040000
2012-01-01	-170452602027.8410000
2013-01-01	-176833271739.4200000
2014-01-01	-198734346862.9530000
2015-01-01	-182583268198.6110000
2016-01-01	-181264932887.8000000
2017-01-01	-180936949070.5600000