Year	US Dollars, Sum Over Component Sub-periods
1981-01-01	111000000
1982-01-01	100000000
1983-01-01	101000000
1984-01-01	90000000
1985-01-01	86000000
1986-01-01	101000000
1987-01-01	127000000
1988-01-01	167000000
1989-01-01	165000000
1990-01-01	217000000
1991-01-01	240000000
1992-01-01	1678000000
1993-01-01	1533000000
1994-01-01	1221000000
1995-01-01	1257000000
1996-01-01	1424000000
1997-01-01	1489000000
1998-01-01	1507000000
1999-01-01	1707000000
2000-01-01	1537000000
2001-01-01	1977000000
2002-01-01	1924000000
2003-01-01	2096000000
2004-01-01	2511000000
2005-01-01	3277000000
2006-01-01	2564000000
2007-01-01	3420000000
2008-01-01	3562000000
2009-01-01	3214000000
2010-01-01	3362000000
2011-01-01	3557000000
2012-01-01	3041000000
2013-01-01	4484000000