Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	-1771600000
1981-01-01	-3269300000
1982-01-01	-1716100000
1983-01-01	-294700000
1984-01-01	-285700000
1985-01-01	-587400000
1986-01-01	-448900000
1987-01-01	334000000
1988-01-01	4200000
1989-01-01	-468200000
1990-01-01	-1921100000
1991-01-01	-1750900000
1992-01-01	-2296200000
1993-01-01	-2129900000
1994-01-01	-1968300000
1995-01-01	135800000
1996-01-01	-73100000
1997-01-01	-1392000000
1998-01-01	-1393000000
1999-01-01	-2771600000
2000-01-01	-3589900000
2001-01-01	-4499500000
2002-01-01	-5283800000
2003-01-01	-5908900000
2004-01-01	-6892400000
2005-01-01	-7068300000
2006-01-01	-7732700000
2007-01-01	-7660500000
2008-01-01	-7976400000
2009-01-01	-10218300000
2010-01-01	-10557400000
2011-01-01	-14792900000
2012-01-01	-14004600000
2013-01-01	-10983400000
2014-01-01	-12451400000
2015-01-01	-9169600000
2016-01-01	-7828300000