Year	US Dollars, Monthly Level
1960-01-01	2315706070.7354100
1961-01-01	2059844852.5984998
1962-01-01	2214262463.8377800
1963-01-01	2435281290.8828900
1964-01-01	2890565406.7099200
1965-01-01	3301336800.4153700
1966-01-01	3158386927.0631404
1967-01-01	3410888162.1731400
1968-01-01	3777504333.5503800
1969-01-01	3936357486.6768300
1970-01-01	4417363857.9377100
1971-01-01	4601752100.9217700
1972-01-01	4534662175.8337500
1973-01-01	6790840679.7242700
1974-01-01	10932738868.2262000
1975-01-01	9830993063.2927800
1976-01-01	11030756822.5395980
1977-01-01	12295675618.2977000
1978-01-01	14174100613.3999000
1979-01-01	16393708475.8490980
1980-01-01	20074445261.4559000
1981-01-01	23530248272.6642000
1982-01-01	23639974992.9722980
1983-01-01	18553650192.8839000
1984-01-01	22533668750.1180000
1985-01-01	23089250985.1322980
1986-01-01	23886002959.9299000
1987-01-01	26946656568.2008000
1988-01-01	33180286859.6511960
1989-01-01	40969119280.1393050
1990-01-01	38830989769.6804000
1991-01-01	38631359705.9632950
1992-01-01	40391873084.9800950
1993-01-01	42262765785.4969000
1994-01-01	49844938965.9211040
1995-01-01	57542868704.4025040
1996-01-01	61105729721.7877000
1997-01-01	61776586095.1413000
1998-01-01	60724435464.8748000
1999-01-01	65334605180.2510100
2000-01-01	67774322484.1064100
2001-01-01	60754705434.7248000
2002-01-01	69412675232.0111000
2003-01-01	84683513117.8388000
2004-01-01	103180978175.9670000
2005-01-01	118763759203.9990100
2006-01-01	133102546079.3490000
2007-01-01	157463228204.3840000
2008-01-01	190110486473.7450000
2009-01-01	158392133684.4800000
2010-01-01	193156412921.2070000
2011-01-01	234285291697.5740000
2012-01-01	250479468575.2420000
2013-01-01	232371231144.2410000
2014-01-01	228020909752.3360000
2015-01-01	200595483081.9970000
2016-01-01	189477051583.4260000
2017-01-01	221266096053.4460000