Year	US Dollars, Sum Over Component Sub-periods
1979-01-01	-2839000000
1980-01-01	-2823000000
1981-01-01	1202000000
1982-01-01	780000000
1983-01-01	6470000000
1984-01-01	13090000000
1985-01-01	12486000000
1986-01-01	8304000000
1987-01-01	11173000000
1988-01-01	19184000000
1989-01-01	16119000000
1990-01-01	10752000000
1991-01-01	10580000000
1992-01-01	15239000000
1993-01-01	13299000000
1994-01-01	10466000000
1995-01-01	-3466000000
1996-01-01	-5599000000
1997-01-01	-6753000000
1998-01-01	-6575000000
1999-01-01	-1199000000
2000-01-01	-698000000
2001-01-01	2650000000
2002-01-01	13121000000
2003-01-01	24794000000
2004-01-01	33641000000
2005-01-01	44703000000
2006-01-01	46457000000
2007-01-01	40032000000
2008-01-01	24836000000
2009-01-01	25290000000
2010-01-01	20147000000
2011-01-01	29793000000
2012-01-01	19395000000
2013-01-01	2286000000
2014-01-01	-3959000000