Year	US Dollars, Monthly Level
1960-01-01	2898778991.7451100
1961-01-01	2937599456.8128600
1962-01-01	3127871675.2465796
1963-01-01	3381723330.8378797
1964-01-01	3857210897.6817700
1965-01-01	4399141541.9956600
1966-01-01	4575630430.7412405
1967-01-01	4727302231.8322200
1968-01-01	5110638351.9992100
1969-01-01	5912995927.3819800
1970-01-01	6986734940.4822090
1971-01-01	7085857052.2956400
1972-01-01	8111163198.8075490
1973-01-01	10906996548.9077000
1974-01-01	16696731013.0448000
1975-01-01	18081787718.1852000
1976-01-01	19034432151.8247000
1977-01-01	20180863827.4534000
1978-01-01	20558793482.7682000
1979-01-01	28672250522.7922020
1980-01-01	33452949446.3415000
1981-01-01	28822763670.7317000
1982-01-01	27558143009.2537000
1983-01-01	26121547056.9981000
1984-01-01	26374111278.0462000
1985-01-01	28504295320.6271000
1986-01-01	32594699804.2458000
1987-01-01	40595533023.3789000
1988-01-01	45595025105.9205000
1989-01-01	49169914759.3489000
1990-01-01	54680847192.6490900
1991-01-01	49954685543.2844000
1992-01-01	49989652053.5567000
1993-01-01	42715458529.0881040
1994-01-01	51798690292.8572000
1995-01-01	64751266354.0095000
1996-01-01	66566718030.0306000
1997-01-01	65551924046.3500000
1998-01-01	68519610721.1631000
1999-01-01	68798418679.6514000
2000-01-01	73548390706.7854000
2001-01-01	64287045422.7886000
2002-01-01	67782412216.1913100
2003-01-01	84180449106.7561000
2004-01-01	100326538151.1820000
2005-01-01	111771907555.4240000
2006-01-01	128051703546.9420000
2007-01-01	153434977887.4970000
2008-01-01	168770807592.3490000
2009-01-01	119969264421.3970000
2010-01-01	148480497830.3450000
2011-01-01	177302205122.9130000
2012-01-01	164851055691.7810000
2013-01-01	160582779837.2580000
2014-01-01	162203259732.0300000
2015-01-01	138265945790.4230000
2016-01-01	141086226715.1550000
2017-01-01	154384730812.1930000