Year	US Dollars, Sum Over Component Sub-periods
1973-01-01	1474260000.0000000
1974-01-01	-3904990000.0000000
1975-01-01	2671430000.0000000
1976-01-01	-3422270000.0000000
1977-01-01	-431210000.0000000
1978-01-01	6998880000.0000000
1979-01-01	5186460000.0000000
1980-01-01	-4169060000.0000005
1981-01-01	-4723200000.0000000
1982-01-01	-12239700000.0000000
1983-01-01	-4801790000.0000000
1984-01-01	-1171640000.0000000
1985-01-01	-329290000.0000000
1986-01-01	1836160000.0000000
1987-01-01	-4437660000.0000000
1988-01-01	-4835140000.0000000
1989-01-01	-4675890000.0000000
1990-01-01	-9835830000.0000000
1991-01-01	-6120180000.0000000
1992-01-01	3868560000.0000000
1993-01-01	9251470000.0000000
1994-01-01	8058780000.0000000
1995-01-01	10918050000.0000000
1996-01-01	20521720000.0000000
1997-01-01	37767450000.0000000
1998-01-01	38500860000.0000000
1999-01-01	45832840000.0000000
2000-01-01	19263730000.0000000
2001-01-01	23517170000.0000000
2002-01-01	18128010000.0000000
2003-01-01	12971620000.0000000
2004-01-01	11134830000.0000000
2005-01-01	-10348990000.0000000
2006-01-01	-12984860000.0000000
2007-01-01	-25906060000.0000000
2008-01-01	-49306830000.0000000
2009-01-01	-34931900000.0000000
2010-01-01	-33715940000.0000040
2011-01-01	-48958590000.0000000
2012-01-01	-57098520000.0000000
2013-01-01	-36836700000.0000000