Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	1885000000
1981-01-01	2444000000
1982-01-01	2824000000
1983-01-01	2350000000
1984-01-01	2441000000
1985-01-01	1758000000
1986-01-01	1629000000
1987-01-01	1840000000
1988-01-01	1691000000
1989-01-01	2352000000
1990-01-01	2841000000
1991-01-01	2865000000
1992-01-01	2422000000
1993-01-01	2450000000
1994-01-01	2772000000
1995-01-01	3405000000
1996-01-01	3601000000
1997-01-01	3821000000
1998-01-01	2695000000
1999-01-01	3279000000
2000-01-01	6414000000
2001-01-01	6601000000
2002-01-01	6867000000
2003-01-01	7103000000
2004-01-01	9369000000
2005-01-01	10177000000
2006-01-01	14088000000
2007-01-01	18915000000
2008-01-01	21653000000
2009-01-01	14514000000
2010-01-01	16354000000
2011-01-01	17733000000
2012-01-01	20260000000
2013-01-01	20701000000