Year	US Dollars, Monthly Level
1960-01-01	99622266.74202030
1961-01-01	82269263.60743540
1962-01-01	88207481.97661320
1963-01-01	107664503.48243500
1964-01-01	121223725.43553400
1965-01-01	133545959.92532001
1966-01-01	156833138.79525000
1967-01-01	158295594.48148500
1968-01-01	133911964.33511701
1969-01-01	122665873.61156900
1970-01-01	154000215.68430200
1971-01-01	208166373.93029300
1972-01-01	233795790.40501300
1973-01-01	333628127.69231600
1974-01-01	509425664.37306100
1975-01-01	473182340.84088700
1976-01-01	463766716.28123300
1977-01-01	597757160.44627110
1978-01-01	681397311.33772200
1979-01-01	818842887.24592600
1980-01-01	1000564865.19678000
1981-01-01	1013793881.86377000
1982-01-01	960129382.69372610
1983-01-01	819610049.93028590
1984-01-01	852697683.95836100
1985-01-01	913069639.79104210
1986-01-01	1113275940.74340000
1987-01-01	1557695854.14818000
1988-01-01	1597752485.36148000
1989-01-01	1405881164.52166000
1990-01-01	1654161121.10297010
1991-01-01	1721915284.87531020
1992-01-01	1660400883.16289000
1993-01-01	1366743368.06773000
1994-01-01	1478957187.16536000
1995-01-01	1778326260.50230000
1996-01-01	2052230399.61061020
1997-01-01	2063278929.58193020
1998-01-01	2477005168.28705020
1999-01-01	2527659256.56547000
2000-01-01	2595281302.07137000
2001-01-01	2289732971.19761040
2002-01-01	2282434866.53083000
2003-01-01	2854254497.60733000
2004-01-01	3747823983.71197000
2005-01-01	5060868449.19246000
2006-01-01	6110606644.14067100
2007-01-01	6537935392.94621900
2008-01-01	6088956155.05317000
2009-01-01	3638556880.91362000
2010-01-01	3925133687.99057000
2011-01-01	4803398984.66158000
2012-01-01	4671076905.42406100
2013-01-01	4766690743.99690100
2014-01-01	5366775609.90808000
2015-01-01	5297751525.26779000
2016-01-01	5678126885.04464000
2017-01-01	6909020222.54769000