Year	US Dollars, Monthly Level
1960-01-01	-312000000.0000000
1961-01-01	-276000000.0000000
1962-01-01	-368000000.0000000
1963-01-01	-476000000.0000000
1964-01-01	-287000000.0000000
1965-01-01	-292000000.0000000
1966-01-01	-466000000.0000000
1967-01-01	-675000000.0000000
1968-01-01	-1006999999.9999999
1969-01-01	-1201000000.0000000
1970-01-01	-1148000000.0000000
1971-01-01	-1328000000.0000000
1972-01-01	-898000000.0000000
1973-01-01	-998000000.0000000
1974-01-01	-2390000000.0000000
1975-01-01	-2331000000.0000000
1976-01-01	-1058000000.0000000
1977-01-01	-764000000.0000000
1978-01-01	-2250000000.0000000
1979-01-01	-5282000000.0000000
1980-01-01	-4781000000.0000000
1981-01-01	-4863000000.0000000
1982-01-01	-2398000000.0000000
1983-01-01	-1746000000.0000000
1984-01-01	-1389000000.0000000
1985-01-01	-847000000.0000000
1986-01-01	2766000000.0000000
1987-01-01	6166000000.0000000
1988-01-01	8870000000.0000000
1989-01-01	910000000.0000000
1990-01-01	-4827947000.0000000
1991-01-01	-9654735000.0000000
1992-01-01	-5143742000.0000000
1993-01-01	-1564279000.0000000
1994-01-01	-6334939000.0000000
1995-01-01	-10060945000.0000000
1996-01-01	-20623965000.0000000
1997-01-01	-8452171999.9999990
1998-01-01	39031388000.0000000
1999-01-01	23933176000.0000000
2000-01-01	11786493000.0000000
2001-01-01	9341323000.0000000
2002-01-01	10344374000.0000000
2003-01-01	14990784000.0000000
2004-01-01	29381986000.0000000
2005-01-01	23180477000.0000000
2006-01-01	16082217000.0000000
2007-01-01	14643353000.0000000
2008-01-01	-13267407000.0000000
2009-01-01	40449040000.0000000
2010-01-01	41171601000.0000000
2011-01-01	30800566000.0000000
2012-01-01	28285318000.0000000
2013-01-01	44046920000.0000000
2014-01-01	47150100000.0000000
2015-01-01	90257530000.0000000
2016-01-01	89233052000.0000000
2017-01-01	95216125000.0000000