Year	US Dollars, Sum Over Component Sub-periods
1979-01-01	-5560000000
1980-01-01	-7020000000
1981-01-01	-10275000000
1982-01-01	-13548000000
1983-01-01	-11044000000
1984-01-01	-11498000000
1985-01-01	-11283000000
1986-01-01	-11150000000
1987-01-01	-10418000000
1988-01-01	-12200000000
1989-01-01	-12667000000
1990-01-01	-11773000000
1991-01-01	-9743000000
1992-01-01	-8152000000
1993-01-01	-10331000000
1994-01-01	-9035000000
1995-01-01	-11058000000
1996-01-01	-11668000000
1997-01-01	-14876000000
1998-01-01	-18189000000
1999-01-01	-18848000000
2000-01-01	-17886000000
2001-01-01	-19743000000
2002-01-01	-18191000000
2003-01-01	-18552000000
2004-01-01	-20520000000
2005-01-01	-25967000000
2006-01-01	-27480000000
2007-01-01	-29291000000
2008-01-01	-40562000000
2009-01-01	-33684000000
2010-01-01	-39486000000
2011-01-01	-47319000000
2012-01-01	-35448000000
2013-01-01	-39778000000
2014-01-01	-40323000000