Year	US Dollars, Monthly Level
1960-01-01	-586750768.50485400
1961-01-01	-687617666.92840600
1962-01-01	-688093690.17024300
1963-01-01	-746394921.60825700
1964-01-01	-689762641.62856100
1965-01-01	-762299570.61764190
1966-01-01	-836887288.95628390
1967-01-01	-1011974828.00411010
1968-01-01	-770424540.16092500
1969-01-01	-732029864.75709800
1970-01-01	-1236103068.64405000
1971-01-01	-1520468584.65710000
1972-01-01	-1094211706.37132000
1973-01-01	-1561159573.14631990
1974-01-01	-2114889746.18547990
1975-01-01	-2345483246.43748000
1976-01-01	-3139185272.55041030
1977-01-01	-4048361916.20699020
1978-01-01	-557089367.01163210
1979-01-01	-93781694.03148511
1980-01-01	1545135973.72116020
1981-01-01	2542602853.18074000
1982-01-01	2101812255.15702990
1983-01-01	4548264928.34940000
1984-01-01	5012300232.56596000
1985-01-01	4478351337.11858000
1986-01-01	-2119441611.69751000
1987-01-01	-1090787882.38928000
1988-01-01	-720505518.37845900
1989-01-01	3506589123.67144000
1990-01-01	6666399559.65005000
1991-01-01	8606244438.71437000
1992-01-01	8977350295.74078000
1993-01-01	7986904529.48198000
1994-01-01	7294908496.42706000
1995-01-01	9138044382.01659000
1996-01-01	13906945602.93450200
1997-01-01	12872886721.59910000
1998-01-01	2931156981.08258000
1999-01-01	11371017740.66070000
2000-01-01	25731262843.39120000
2001-01-01	26476461573.67109700
2002-01-01	24718216220.82080000
2003-01-01	28282423280.07450000
2004-01-01	33912845299.09599700
2005-01-01	48445737112.02740500
2006-01-01	58261842538.21509600
2007-01-01	55977171979.63280000
2008-01-01	79373561888.93010000
2009-01-01	47796986323.92060000
2010-01-01	53180730574.54459000
2011-01-01	69923264885.81220000
2012-01-01	73614141653.66730000
2013-01-01	66290250331.60689500
2014-01-01	54757996030.79740000
2015-01-01	27481221187.17020000
2016-01-01	14631468431.09330000
2017-01-01	21497973538.66320000