Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	2660000000
1981-01-01	3659000000
1982-01-01	3839000000
1983-01-01	3428000000
1984-01-01	3963000000
1985-01-01	3993000000
1986-01-01	4035000000
1987-01-01	3578000000
1988-01-01	3073000000
1989-01-01	2965000000
1990-01-01	2982000000
1991-01-01	3075000000
1992-01-01	2845000000
1993-01-01	2900000000
1994-01-01	3322000000
1995-01-01	4788000000
1996-01-01	5480000000
1997-01-01	6333000000
1998-01-01	8313000000
1999-01-01	8404000000
2000-01-01	8797000000
2001-01-01	7848000000
2002-01-01	6467000000
2003-01-01	6850000000
2004-01-01	8328000000
2005-01-01	11994000000
2006-01-01	14014000000
2007-01-01	18780000000
2008-01-01	17218000000
2009-01-01	12238000000
2010-01-01	15338000000
2011-01-01	14842000000
2012-01-01	14542000000
2013-01-01	15898000000