Year	US Dollars, Monthly Level
1960-01-01	1809440620.9874200
1961-01-01	1876746768.6992500
1962-01-01	2135015114.0551400
1963-01-01	2128908349.3554401
1964-01-01	2603209257.7286400
1965-01-01	2821836184.5912000
1966-01-01	3010253266.2502100
1967-01-01	3143811060.3215203
1968-01-01	3219248787.1100802
1969-01-01	3799799602.4083300
1970-01-01	4404415753.2522600
1971-01-01	4618626118.4470300
1972-01-01	5089463648.5201700
1973-01-01	7828197562.9940405
1974-01-01	9947336208.6462210
1975-01-01	10356660000.0595000
1976-01-01	11860743480.2403010
1977-01-01	13299626722.7709000
1978-01-01	14645294636.4890000
1979-01-01	18467448221.7160000
1980-01-01	19304958224.8494000
1981-01-01	17541525635.1768000
1982-01-01	16650281238.6866990
1983-01-01	16239411779.1954000
1984-01-01	16558608757.3066000
1985-01-01	18207680768.1770970
1986-01-01	22869640290.1303980
1987-01-01	25437638967.0759000
1988-01-01	27152244824.8681000
1989-01-01	28121143194.7043000
1990-01-01	33188099803.2471960
1991-01-01	34126793993.6109050
1992-01-01	35394977724.1687000
1993-01-01	31365945271.2849000
1994-01-01	36634574600.7582000
1995-01-01	45792473529.6247000
1996-01-01	44826876548.4179000
1997-01-01	44387479206.0494000
1998-01-01	46274900546.9702000
1999-01-01	44481015020.1311000
2000-01-01	44418385239.9238000
2001-01-01	44111009230.8604000
2002-01-01	48962220795.7178000
2003-01-01	56279851197.0150000
2004-01-01	66650877634.0786000
2005-01-01	72882825738.5456100
2006-01-01	84340669114.7540000
2007-01-01	97274336754.8740000
2008-01-01	108819956992.9530000
2009-01-01	80075205291.0419900
2010-01-01	82717037969.9668900
2011-01-01	96441048187.9306000
2012-01-01	91304778101.8283100
2013-01-01	97214502417.0145000
2014-01-01	98920075516.9301900
2015-01-01	85184387209.5215000
2016-01-01	84338552826.4169000
2017-01-01	92283206920.0266000