Year	US Dollars, Sum Over Component Sub-periods
1987-01-01	587570000
1988-01-01	2148870000
1989-01-01	950980000
1990-01-01	908260000
1991-01-01	2074900000
1992-01-01	1623080000
1993-01-01	1731250000
1994-01-01	1368620000
1995-01-01	819580000
1996-01-01	512510000
1997-01-01	889890000
1998-01-01	901250000
1999-01-01	-405980000
2000-01-01	576050000
2001-01-01	1396060000
2002-01-01	134520000
2003-01-01	-552940000
2004-01-01	-1697140000
2005-01-01	-3140430000
2006-01-01	-2444150000
2007-01-01	-2299830000
2008-01-01	-2308700000
2009-01-01	1133740000
2010-01-01	2056830000
2011-01-01	2299350000
2012-01-01	121470000
2013-01-01	1070970000