Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	536000000
1981-01-01	615000000
1982-01-01	656000000
1983-01-01	724000000
1984-01-01	686000000
1985-01-01	852000000
1986-01-01	1369000000
1987-01-01	1839000000
1988-01-01	2293000000
1989-01-01	1132000000
1990-01-01	1150000000
1991-01-01	803000000
1992-01-01	1091000000
1993-01-01	1188000000
1994-01-01	1280000000
1995-01-01	-19000000
1996-01-01	-49000000
1997-01-01	623000000
1998-01-01	3320000000
1999-01-01	1869000000
2000-01-01	566000000
2001-01-01	-385000000
2002-01-01	-1618000000
2003-01-01	-2905000000
2004-01-01	-2432000000
2005-01-01	-2482000000
2006-01-01	-4093000000
2007-01-01	-3527000000
2008-01-01	-674000000
2009-01-01	-712000000
2010-01-01	-3079000000
2011-01-01	-2633000000
2012-01-01	-3186000000
2013-01-01	-789000000