Year	US Dollars, Sum Over Component Sub-periods
1971-01-01	-2419960000
1972-01-01	-1940940000
1973-01-01	-6040370000
1974-01-01	-10448200000
1975-01-01	-4648850000
1976-01-01	-4608270000
1977-01-01	-4578520000
1978-01-01	-8446650000
1979-01-01	6543980000
1980-01-01	13246380000
1981-01-01	3272840000
1982-01-01	-2757450000
1983-01-01	-5165710000
1984-01-01	-12769380000
1985-01-01	-20693150000
1986-01-01	-41814070000
1987-01-01	-45355120000
1988-01-01	-55426360000
1989-01-01	-62237360000
1990-01-01	-66755340000
1991-01-01	10703560000
1992-01-01	9354130000
1993-01-01	25120740000
1994-01-01	35781510000
1995-01-01	32289970000
1996-01-01	13961010000
1997-01-01	3876670000
1998-01-01	15330280000
1999-01-01	-11240060000
2000-01-01	30032160000
2001-01-01	-10908700000
2002-01-01	-36434880000
2003-01-01	-69418360000
2004-01-01	-152261330000
2005-01-01	-162815170000
2006-01-01	-220574740000
2007-01-01	-287544190000
2008-01-01	-254568300000
2009-01-01	-217266180000
2010-01-01	-166251210000
2011-01-01	-242081680000
2012-01-01	-286230410000
2013-01-01	-330265940000