Year	US Dollars, Sum Over Component Sub-periods
1981-01-01	6806000000
1982-01-01	1893000000
1983-01-01	963000000
1984-01-01	5707000000
1985-01-01	5822000000
1986-01-01	2458000000
1987-01-01	4674000000
1988-01-01	5678000000
1989-01-01	6664000000
1990-01-01	5352000000
1991-01-01	4801000000
1992-01-01	7022000000
1993-01-01	8231000000
1994-01-01	7901000000
1995-01-01	6533000000
1996-01-01	5948000000
1997-01-01	10075000000
1998-01-01	18429000000
1999-01-01	20643000000
2000-01-01	25042000000
2001-01-01	22696000000
2002-01-01	23513000000
2003-01-01	24563000000
2004-01-01	20152000000
2005-01-01	17534000000
2006-01-01	29660000000
2007-01-01	32754000000
2008-01-01	22916000000
2009-01-01	30931000000
2010-01-01	30627000000
2011-01-01	34783000000
2012-01-01	8619000000
2013-01-01	6150000000