Year	US Dollars, Sum Over Component Sub-periods
1988-01-01	795960000
1989-01-01	683710000
1990-01-01	1786350000
1991-01-01	2770770000
1992-01-01	2295820000
1993-01-01	1636330000
1994-01-01	530640000
1995-01-01	710770000
1996-01-01	1295050000
1997-01-01	119620000
1998-01-01	-316150000
1999-01-01	2038130000
2000-01-01	2373260000
2001-01-01	3405680000
2002-01-01	2011850000
2003-01-01	3532000000
2004-01-01	3304520000
2005-01-01	6180360000
2006-01-01	7061070000
2007-01-01	7413160000
2008-01-01	10111110000
2009-01-01	3879900000
2010-01-01	8707420000
2011-01-01	7626200000
2012-01-01	7744290000
2013-01-01	10565080000