Year	US Dollars, Monthly Level
1960-01-01	-1088395835.5323000
1961-01-01	-1052909275.1423801
1962-01-01	-1409190343.1146898
1963-01-01	-2555309948.3627300
1964-01-01	-1266793134.9022800
1965-01-01	-170707661.3470040
1966-01-01	-544573574.1340040
1967-01-01	-1128211030.2229900
1968-01-01	-90603718.9044617
1969-01-01	-755736660.0609440
1970-01-01	-1766268478.0077400
1971-01-01	-873298115.2462700
1972-01-01	-766718610.5821800
1973-01-01	-5626293864.3555900
1974-01-01	-10964847342.2339000
1975-01-01	-3505169552.3939700
1976-01-01	-6658037000.5997710
1977-01-01	-2811907583.8421200
1978-01-01	-383123821.9377770
1979-01-01	-5126406225.2274290
1980-01-01	-22298183491.3850000
1981-01-01	-15860045820.1689000
1982-01-01	-12831068463.4103010
1983-01-01	-7903448393.3165690
1984-01-01	-11124066087.2110000
1985-01-01	-12241854395.7104000
1986-01-01	-2286861261.8236403
1987-01-01	-8631326014.9850790
1988-01-01	-10209471310.8753000
1989-01-01	-12863723467.9115000
1990-01-01	-11548719977.8158000
1991-01-01	-12896847914.8505000
1992-01-01	-8599165904.8441600
1993-01-01	20500618810.6409000
1994-01-01	22730986345.6506000
1995-01-01	25862261103.5724000
1996-01-01	43165787983.1668000
1997-01-01	30578476119.0608980
1998-01-01	27025224317.2052000
1999-01-01	15438070297.5668000
2000-01-01	2215011247.5200500
2001-01-01	8905447917.3193800
2002-01-01	8147473451.6470995
2003-01-01	3359719364.5855500
2004-01-01	-2109926672.0575497
2005-01-01	-12164011725.8812000
2006-01-01	-25651401143.2722970
2007-01-01	-12346721323.1061000
2008-01-01	-18820807571.1922000
2009-01-01	-8459289271.4356200
2010-01-01	-40243905503.8058000
2011-01-01	-36547841261.2306000
2012-01-01	12100289013.3867990
2013-01-01	38393322587.7970050
2014-01-01	55461549034.5271000
2015-01-01	46750927001.8037000
2016-01-01	53689916862.0941000
2017-01-01	53124697203.5753000