Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	285260000
1981-01-01	379750000
1982-01-01	397000000
1983-01-01	97580000
1984-01-01	835310000
1985-01-01	937500000
1986-01-01	617410000
1987-01-01	829440000
1988-01-01	1340590000
1989-01-01	-281950000
1990-01-01	138860000
1991-01-01	603730000
1992-01-01	2913240000
1993-01-01	1360440000
1994-01-01	807010000
1995-01-01	3773080000
1996-01-01	3913970000
1997-01-01	2522900000
1998-01-01	349740000
1999-01-01	384300000
2000-01-01	3009950000
2001-01-01	495860000
2002-01-01	794610000
2003-01-01	1214380000
2004-01-01	2298190000
2005-01-01	2971520000
2006-01-01	5080960000
2007-01-01	-1761970000
2008-01-01	3566530000
2009-01-01	736250000
2010-01-01	-13690000
2011-01-01	1617120000
2012-01-01	2711960000
2013-01-01	183550000