Year	US Dollars, Monthly Level
1960-01-01	158047584.90765000
1961-01-01	310976493.96318200
1962-01-01	370744329.70454100
1963-01-01	340779657.28534895
1964-01-01	368250729.83831200
1965-01-01	452111783.08209400
1966-01-01	462903833.75649804
1967-01-01	484569984.85698400
1968-01-01	457118223.73915000
1969-01-01	533770912.78031397
1970-01-01	568867293.77316310
1971-01-01	573858870.03769900
1972-01-01	828902750.33768200
1973-01-01	1305662936.82767000
1974-01-01	1474537583.41747020
1975-01-01	1420551993.35058000
1976-01-01	1961459838.46805000
1977-01-01	1748341996.52461000
1978-01-01	2264777293.77820970
1979-01-01	2211562410.62260000
1980-01-01	2982566341.17164000
1981-01-01	4641825277.60990000
1982-01-01	5666404986.94747100
1983-01-01	6026182770.28693000
1984-01-01	7144175555.60415900
1985-01-01	7973940541.85710050
1986-01-01	7658527911.25659000
1987-01-01	10169994955.73639900
1988-01-01	11706797343.54750000
1989-01-01	11635689766.65820000
1990-01-01	13135470814.64680000
1991-01-01	13898786180.37400000
1992-01-01	14983261675.38609900
1993-01-01	15961863059.52940000
1994-01-01	17735038852.03130000
1995-01-01	22346765775.74139800
1996-01-01	23728031241.53429800
1997-01-01	26899492826.09830000
1998-01-01	27565528533.41000000
1999-01-01	27205092611.06030300
2000-01-01	28923725880.54210000
2001-01-01	30844660643.44730000
2002-01-01	37212499082.74250000
2003-01-01	48220413561.85140000
2004-01-01	63583302608.52710000
2005-01-01	75980807776.14690000
2006-01-01	87322751366.13199000
2007-01-01	112395227356.20100000
2008-01-01	133454168177.58800000
2009-01-01	105584621670.91500000
2010-01-01	113822609558.74400000
2011-01-01	134960640675.73999000
2012-01-01	152857220473.24100000
2013-01-01	153549951509.76400000
2014-01-01	157753428002.87000000
2015-01-01	143059403941.70900000
2016-01-01	143776165818.31198000
2017-01-01	156267282937.86700000