Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	1866000000
1981-01-01	2446000000
1982-01-01	2821000000
1983-01-01	2367000000
1984-01-01	2433000000
1985-01-01	1760000000
1986-01-01	1631000000
1987-01-01	1829000000
1988-01-01	1693000000
1989-01-01	2357000000
1990-01-01	2833000000
1991-01-01	2853000000
1992-01-01	2366000000
1993-01-01	2470000000
1994-01-01	2802000000
1995-01-01	3404000000
1996-01-01	3566000000
1997-01-01	3830000000
1998-01-01	2703000000
1999-01-01	3216000000
2000-01-01	6391000000
2001-01-01	6507000000
2002-01-01	6772000000
2003-01-01	7042000000
2004-01-01	9285000000
2005-01-01	10241000000
2006-01-01	14178000000
2007-01-01	18847000000
2008-01-01	21538000000
2009-01-01	14483000000
2010-01-01	16372000000
2011-01-01	17781000000
2012-01-01	20218000000
2013-01-01	20588000000