Year	US Dollars, Monthly Level
1960-01-01	778777988.5315460
1961-01-01	901413642.2087810
1962-01-01	754754149.2635220
1963-01-01	896747960.6409280
1964-01-01	952984246.0004650
1965-01-01	1046664836.6187601
1966-01-01	1091870686.7284000
1967-01-01	948093226.9591760
1968-01-01	883668791.6010310
1969-01-01	988902030.8599120
1970-01-01	1237501878.6173700
1971-01-01	1347895292.2605600
1972-01-01	1525985359.9413300
1973-01-01	2182625538.6442003
1974-01-01	3672272483.9061100
1975-01-01	3187226197.2871600
1976-01-01	3260867872.4335100
1977-01-01	3383820203.0746400
1978-01-01	3502475885.8814600
1979-01-01	4529940910.2289095
1980-01-01	5446069128.5075600
1981-01-01	5726242706.2059700
1982-01-01	5868249018.0495900
1983-01-01	5339522119.2307600
1984-01-01	6176885304.4384710
1985-01-01	5961135476.8734610
1986-01-01	6062073545.9383000
1987-01-01	7249575473.5484910
1988-01-01	7318730052.1612200
1989-01-01	8817972233.4018000
1990-01-01	9467345987.9615100
1991-01-01	8400576086.1345100
1992-01-01	9163590013.6196900
1993-01-01	9598531397.7662900
1994-01-01	11867739076.3912000
1995-01-01	13982004893.7577000
1996-01-01	14683039899.7801000
1997-01-01	14561013418.5899000
1998-01-01	12493714272.6451000
1999-01-01	14228485709.0334000
2000-01-01	13935289468.9316000
2001-01-01	13312222199.0316000
2002-01-01	14990256722.3033000
2003-01-01	18519854596.7662000
2004-01-01	23076084031.0911000
2005-01-01	26249507077.7487000
2006-01-01	26494611146.3696980
2007-01-01	30818312385.7423970
2008-01-01	34346067752.9670030
2009-01-01	25463068491.5574000
2010-01-01	30585261633.0828000
2011-01-01	37126800777.8183060
2012-01-01	38255627108.1246000
2013-01-01	39548806217.1374000
2014-01-01	42522265048.1182000
2015-01-01	36584823136.2043000
2016-01-01	35955633655.7327960
2017-01-01	40204987312.5995000