Year	US Dollars, Sum Over Component Sub-periods
1987-01-01	624140000
1988-01-01	540160000
1989-01-01	489230000
1990-01-01	829590000
1991-01-01	266010000
1992-01-01	-63980000
1993-01-01	159400000
1994-01-01	641340000
1995-01-01	1481020000
1996-01-01	1101370000
1997-01-01	1232360000
1998-01-01	1630700000
1999-01-01	1673070000
2000-01-01	1514500000
2001-01-01	1390180000
2002-01-01	2047780000
2003-01-01	2641700000
2004-01-01	3135160000
2005-01-01	3431810000
2006-01-01	3458660000
2007-01-01	4738520000
2008-01-01	3863980000
2009-01-01	2943730000
2010-01-01	3893140000
2011-01-01	4495260000
2012-01-01	4981790000
2013-01-01	5186050000