Year	US Dollars, Monthly Level
1960-01-01	2232370983.2718600
1961-01-01	2704373092.3881900
1962-01-01	3003715250.8151800
1963-01-01	3233186849.0070400
1964-01-01	3586959621.8988800
1965-01-01	3678429789.9154000
1966-01-01	3940459670.8836503
1967-01-01	4124171494.7036800
1968-01-01	4484848859.5399800
1969-01-01	5266500278.6405910
1970-01-01	6452072886.1554300
1971-01-01	7205630181.8763400
1972-01-01	8511724216.1315590
1973-01-01	11604896410.0129000
1974-01-01	14427519196.7256000
1975-01-01	13283597205.3799000
1976-01-01	14713187708.1877000
1977-01-01	18021378881.5833970
1978-01-01	23861896037.6837000
1979-01-01	29323678498.6054000
1980-01-01	35034008366.6521000
1981-01-01	30587341854.2548000
1982-01-01	28595253291.6432000
1983-01-01	29161192095.7090000
1984-01-01	29436216374.1122970
1985-01-01	30654780216.2766000
1986-01-01	40995935671.3172000
1987-01-01	50437936853.3531000
1988-01-01	56237667365.8092040
1989-01-01	58383629897.3638000
1990-01-01	64793998139.8720000
1991-01-01	62014817667.5349960
1992-01-01	61523745871.9533000
1993-01-01	56566650799.8066000
1994-01-01	64180425049.3617000
1995-01-01	77034758429.0242900
1996-01-01	74138163103.4614900
1997-01-01	71005431460.0781000
1998-01-01	73746896674.7288000
1999-01-01	75294571768.2936000
2000-01-01	76385756399.4558000
2001-01-01	77006873079.7813000
2002-01-01	82354837489.0108000
2003-01-01	95515744455.1904000
2004-01-01	109888735005.9610000
2005-01-01	119977185493.1640000
2006-01-01	132427431343.4330000
2007-01-01	152961808519.3920000
2008-01-01	172450337795.5080000
2009-01-01	147584068031.3240000
2010-01-01	167031102215.1120000
2011-01-01	197358020567.8410000
2012-01-01	188860637925.3079800
2013-01-01	191450577537.7140000
2014-01-01	195273092742.5830000
2015-01-01	172555291520.9050000
2016-01-01	176422584761.2980000
2017-01-01	188960883848.8740000