Year	US Dollars, Sum Over Component Sub-periods
1960-01-01	-1134290000
1961-01-01	-403520000
1962-01-01	-292010000
1963-01-01	-344430000
1964-01-01	-1538670000
1965-01-01	-735410000
1966-01-01	-310050000
1967-01-01	-1647770000
1968-01-01	-1694720000
1969-01-01	-511530000
1970-01-01	-43130000
1971-01-01	500920000
1972-01-01	-1838210000
1973-01-01	-6302420000
1974-01-01	-12257920000
1975-01-01	-7182850000
1976-01-01	-7059720000
1977-01-01	-3961410000
1978-01-01	-2942030000
1979-01-01	-7045200000
1980-01-01	3089000000
1981-01-01	6505280000
1982-01-01	3281340000
1983-01-01	-2452300000
1984-01-01	-7196880000
1985-01-01	-4383290000
1986-01-01	-14097230000
1987-01-01	-19126140000
1988-01-01	-38340150000
1989-01-01	-40437440000
1990-01-01	-33225580000
1991-01-01	-18033340000
1992-01-01	-22905570000
1993-01-01	-19617480000
1994-01-01	-17031360000
1995-01-01	-18972770000
1996-01-01	-21413220000
1997-01-01	-19932800000
1998-01-01	-36054940000
1999-01-01	-47122820000
2000-01-01	-50356440000
2001-01-01	-59452170000
2002-01-01	-71441830000
2003-01-01	-79383760000
2004-01-01	-111916290000
2005-01-01	-125701910000
2006-01-01	-141414300000
2007-01-01	-181161260000
2008-01-01	-172735240000
2009-01-01	-129317300000
2010-01-01	-152263690000
2011-01-01	-160452860000
2012-01-01	-172245270000
2013-01-01	-168645150000