Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	0
1981-01-01	0
1982-01-01	0
1983-01-01	0
1984-01-01	0
1985-01-01	0
1986-01-01	0
1987-01-01	0
1988-01-01	-473000000
1989-01-01	-709000000
1990-01-01	-500000000
1991-01-01	198000000
1992-01-01	76000000
1993-01-01	-986000000
1994-01-01	-2481000000
1995-01-01	-2907000000
1996-01-01	-6413000000
1997-01-01	1076000000
1998-01-01	-1999000000
1999-01-01	1282000000
2000-01-01	-520000000
2001-01-01	-5521000000
2002-01-01	-5032000000
2003-01-01	-5403000000
2004-01-01	-11776000000
2005-01-01	-17632000000
2006-01-01	-31286000000
2007-01-01	-56436000000
2008-01-01	23484000000
2009-01-01	1436000000
2010-01-01	-1190000000
2011-01-01	-4094000000
2012-01-01	-26153000000
2013-01-01	-27046000000