Year	US Dollars, Sum Over Component Sub-periods
1975-01-01	-1771200000
1976-01-01	-712400000
1977-01-01	386000000
1978-01-01	1041000000
1979-01-01	313600000
1980-01-01	-732100000
1981-01-01	428200000
1982-01-01	260700000
1983-01-01	246800000
1984-01-01	1626300000
1985-01-01	977800000
1986-01-01	1746000000
1987-01-01	1572900000
1988-01-01	1315200000
1989-01-01	-73500000
1990-01-01	909900000
1991-01-01	2477900000
1992-01-01	4002900000
1993-01-01	6439700000
1994-01-01	7732000000
1995-01-01	12581400000
1996-01-01	11625400000
1997-01-01	11823400000
1998-01-01	12757400000
1999-01-01	11806300000
2000-01-01	13469700000
2001-01-01	12265700000
2002-01-01	12315000000
2003-01-01	12388700000
2004-01-01	12144900000
2005-01-01	9137500000
2006-01-01	10827000000
2007-01-01	12499600000
2008-01-01	9926000000
2009-01-01	4213500000
2010-01-01	3388000000
2011-01-01	-1748000000
2012-01-01	-117900000
2013-01-01	172600000