Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	2595000000
1981-01-01	3636000000
1982-01-01	3836000000
1983-01-01	3429000000
1984-01-01	3992000000
1985-01-01	4038000000
1986-01-01	4041000000
1987-01-01	3567000000
1988-01-01	3086000000
1989-01-01	2975000000
1990-01-01	2970000000
1991-01-01	3068000000
1992-01-01	2810000000
1993-01-01	2877000000
1994-01-01	3330000000
1995-01-01	4780000000
1996-01-01	5496000000
1997-01-01	6359000000
1998-01-01	8438000000
1999-01-01	8415000000
2000-01-01	8896000000
2001-01-01	8006000000
2002-01-01	6585000000
2003-01-01	6653000000
2004-01-01	8044000000
2005-01-01	11878000000
2006-01-01	14036000000
2007-01-01	18297000000
2008-01-01	16921000000
2009-01-01	12916000000
2010-01-01	15839000000
2011-01-01	14232000000
2012-01-01	14944000000
2013-01-01	16165000000