Year	US Dollars, Monthly Level
1960-01-01	-210329221.43587902
1961-01-01	-228187449.90688600
1962-01-01	-277968653.69187200
1963-01-01	-308243815.59339400
1964-01-01	-351494573.37686104
1965-01-01	-428158015.18863700
1966-01-01	-366385455.21509800
1967-01-01	-293415967.87405896
1968-01-01	-366729221.80946400
1969-01-01	-502764438.03632000
1970-01-01	-501284139.91375196
1971-01-01	-525092848.99820800
1972-01-01	-516869666.56953806
1973-01-01	-669793018.98346600
1974-01-01	-1170689950.88485000
1975-01-01	-598534641.77672800
1976-01-01	-884289093.14092400
1977-01-01	-1038069599.09294010
1978-01-01	-1444140708.65764020
1979-01-01	-2728537708.49678000
1980-01-01	-2729862844.81430000
1981-01-01	-2900709124.78720000
1982-01-01	-1606620839.79129000
1983-01-01	-547754662.46932300
1984-01-01	-19736492.77116070
1985-01-01	357674820.24531200
1986-01-01	1032240018.75146000
1987-01-01	2326894261.39110000
1988-01-01	3147187963.82042030
1989-01-01	3259782945.00407030
1990-01-01	3115971389.58945000
1991-01-01	3501933131.35105040
1992-01-01	6010787052.13458000
1993-01-01	7203219708.51880900
1994-01-01	8092276680.72716000
1995-01-01	11938475997.59790000
1996-01-01	13840104264.47430000
1997-01-01	16405372219.40420000
1998-01-01	21104717230.75100000
1999-01-01	24280844731.27490000
2000-01-01	26117226649.19659800
2001-01-01	32198548272.29300300
2002-01-01	35619773783.41900000
2003-01-01	38778723914.41590000
2004-01-01	42645193810.13270600
2005-01-01	40794317641.98390000
2006-01-01	35593697656.15420000
2007-01-01	37505470993.04820000
2008-01-01	41518908232.53370000
2009-01-01	52747398808.04060000
2010-01-01	54185750901.40510000
2011-01-01	54041892361.62900500
2012-01-01	48048331106.48100000
2013-01-01	43052171531.90349600
2014-01-01	39313640757.48140000
2015-01-01	46373313846.06720000
2016-01-01	49853390407.95410000
2017-01-01	48658720468.62290000