Year	US Dollars, Sum Over Component Sub-periods
1981-01-01	250000000
1982-01-01	134000000
1983-01-01	114000000
1984-01-01	167000000
1985-01-01	88000000
1986-01-01	259000000
1987-01-01	257000000
1988-01-01	254000000
1989-01-01	339000000
1990-01-01	418000000
1991-01-01	262000000
1992-01-01	571000000
1993-01-01	537000000
1994-01-01	619000000
1995-01-01	981000000
1996-01-01	937000000
1997-01-01	1034000000
1998-01-01	1466000000
1999-01-01	1914000000
2000-01-01	1816000000
2001-01-01	1520000000
2002-01-01	1740000000
2003-01-01	1869000000
2004-01-01	1139000000
2005-01-01	4793000000
2006-01-01	4863000000
2007-01-01	5104000000
2008-01-01	5363000000
2009-01-01	4578000000
2010-01-01	4630000000
2011-01-01	4210000000
2012-01-01	4094000000
2013-01-01	4057000000