Year	US Dollars, Sum Over Component Sub-periods
1988-01-01	1927390000
1989-01-01	1449100000
1990-01-01	5486520000
1991-01-01	2643550000
1992-01-01	412590000
1993-01-01	-81230000
1994-01-01	3372180000
1995-01-01	2224890000
1996-01-01	3082200000
1997-01-01	6641300000
1998-01-01	8940070000
1999-01-01	11714120000
2000-01-01	19265580000
2001-01-01	8859320000
2002-01-01	6283970000
2003-01-01	16525980000
2004-01-01	932860000
2005-01-01	-950610000
2006-01-01	43740120000
2007-01-01	32448720000
2008-01-01	15204640000
2009-01-01	28945150000
2010-01-01	35151420000
2011-01-01	26614980000
2012-01-01	10240220000
2013-01-01	-5251480000