Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	530000000
1981-01-01	608000000
1982-01-01	650000000
1983-01-01	726000000
1984-01-01	688000000
1985-01-01	852000000
1986-01-01	1374000000
1987-01-01	1834000000
1988-01-01	2299000000
1989-01-01	1142000000
1990-01-01	1151000000
1991-01-01	796000000
1992-01-01	1084000000
1993-01-01	1190000000
1994-01-01	1270000000
1995-01-01	-1000000
1996-01-01	-62000000
1997-01-01	547000000
1998-01-01	3340000000
1999-01-01	1884000000
2000-01-01	578000000
2001-01-01	-403000000
2002-01-01	-1638000000
2003-01-01	-2939000000
2004-01-01	-2435000000
2005-01-01	-2442000000
2006-01-01	-4115000000
2007-01-01	-3560000000
2008-01-01	-656000000
2009-01-01	-640000000
2010-01-01	-2977000000
2011-01-01	-2634000000
2012-01-01	-3234000000
2013-01-01	-849000000