Year	US Dollars, Monthly Level
1960-01-01	206742501.28907502
1961-01-01	218321292.86865100
1962-01-01	250418131.42767500
1963-01-01	288188104.48317300
1964-01-01	298675324.06139004
1965-01-01	332498577.71712300
1966-01-01	407480219.66315000
1967-01-01	489544736.90730000
1968-01-01	466322524.82978200
1969-01-01	542667350.26321600
1970-01-01	646463569.81525700
1971-01-01	652932348.93969600
1972-01-01	867619695.01268800
1973-01-01	1395518986.83484000
1974-01-01	2031732765.88429000
1975-01-01	2293840692.61794040
1976-01-01	2542360576.37408000
1977-01-01	2748994657.08666000
1978-01-01	3362416046.92820020
1979-01-01	3870719014.60570000
1980-01-01	5138053566.46692900
1981-01-01	4244732633.43284030
1982-01-01	4375866151.85561000
1983-01-01	4373669845.07797000
1984-01-01	4815926617.48325000
1985-01-01	4534864444.11230000
1986-01-01	5640260840.69734000
1987-01-01	6874134152.92113000
1988-01-01	5296052319.32428100
1989-01-01	7443827566.38844000
1990-01-01	8144886810.29848000
1991-01-01	8660044729.46984100
1992-01-01	9732773432.73108000
1993-01-01	10651817540.09380000
1994-01-01	11100952902.99100100
1995-01-01	12426645638.16289900
1996-01-01	13018741347.52660000
1997-01-01	12570327951.37690000
1998-01-01	11252240657.44050000
1999-01-01	11543308332.44200100
2000-01-01	11916148362.58620000
2001-01-01	11420634564.40040000
2002-01-01	11437960266.17670000
2003-01-01	14140117927.05630100
2004-01-01	16509299944.79189900
2005-01-01	18359117580.50940000
2006-01-01	21525205906.61220000
2007-01-01	26490375003.00000000
2008-01-01	31202368876.80529800
2009-01-01	25066923031.25580200
2010-01-01	28049750373.40590000
2011-01-01	33826614992.82650000
2012-01-01	35486426963.97570000
2013-01-01	36348452680.76530000
2014-01-01	36131878258.59579500
2015-01-01	28784565171.82510000
2016-01-01	28127379860.93710000
2017-01-01	32637372570.26439700