Year	US Dollars, Sum Over Component Sub-periods
1988-01-01	1249900000
1989-01-01	2255620000
1990-01-01	3551410000
1991-01-01	3241560000
1992-01-01	766950000
1993-01-01	3314060000
1994-01-01	1915060000
1995-01-01	1495260000
1996-01-01	2044130000
1997-01-01	2015000000
1998-01-01	3989860000
1999-01-01	1176270000
2000-01-01	1052440000
2001-01-01	33140000
2002-01-01	-2874470000
2003-01-01	-2659400000
2004-01-01	1482240000
2005-01-01	-666150000
2006-01-01	-1587810000
2007-01-01	-9742840000
2008-01-01	-12582200000
2009-01-01	-10178540000
2010-01-01	-9849850000
2011-01-01	-7788370000
2012-01-01	1139680000
2013-01-01	3482060000