Year	US Dollars, Sum Over Component Sub-periods
1982-01-01	-3420910000
1983-01-01	-750870000
1984-01-01	721490000
1985-01-01	-1155630000
1986-01-01	911340000
1987-01-01	286840000
1988-01-01	-490400000
1989-01-01	-3108840000
1990-01-01	-6244770000
1991-01-01	-4699910000
1992-01-01	-7372510000
1993-01-01	-2593800000
1994-01-01	2363720000
1995-01-01	8425350000
1996-01-01	9627890000
1997-01-01	10326560000
1998-01-01	9704820000
1999-01-01	10634040000
2000-01-01	10287990000
2001-01-01	11360330000
2002-01-01	11814860000
2003-01-01	21837520000
2004-01-01	24030350000
2005-01-01	25103300000
2006-01-01	34679830000
2007-01-01	43238740000
2008-01-01	43888060000
2009-01-01	25431050000
2010-01-01	29376410000
2011-01-01	32743120000
2012-01-01	31373480000
2013-01-01	38586540000