Year	US Dollars, Sum Over Component Sub-periods
1988-01-01	-722130000
1989-01-01	-2899350000
1990-01-01	-1669070000
1991-01-01	-2308270000
1992-01-01	-218450000
1993-01-01	29152620000
1994-01-01	35872290000
1995-01-01	39904850000
1996-01-01	60174490000
1997-01-01	47094460000
1998-01-01	35520680000
1999-01-01	23494430000
2000-01-01	9547540000
2001-01-01	15591540000
2002-01-01	13230100000
2003-01-01	11209230000
2004-01-01	11000640000
2005-01-01	668640000
2006-01-01	-12806620000
2007-01-01	4386120000
2008-01-01	-3112650000
2009-01-01	1143370000
2010-01-01	-27704360000
2011-01-01	-24164340000
2012-01-01	21895710000
2013-01-01	49434640000