Year	US Dollars, Sum Over Component Sub-periods
1979-01-01	5446000000
1980-01-01	8237000000
1981-01-01	11780000000
1982-01-01	9793000000
1983-01-01	6564000000
1984-01-01	5302000000
1985-01-01	-1723000000
1986-01-01	426000000
1987-01-01	3105000000
1988-01-01	-7586000000
1989-01-01	1181000000
1990-01-01	5808000000
1991-01-01	-486000000
1992-01-01	-6510000000
1993-01-01	2688000000
1994-01-01	-30547000000
1995-01-01	18019000000
1996-01-01	10989000000
1997-01-01	-2846000000
1998-01-01	-2893000000
1999-01-01	-9223000000
2000-01-01	-15213000000
2001-01-01	9353000000
2002-01-01	2150000000
2003-01-01	-686000000
2004-01-01	-8721000000
2005-01-01	-22486000000
2006-01-01	24486000000
2007-01-01	31683000000
2008-01-01	8149000000
2009-01-01	14076000000
2010-01-01	41543000000
2011-01-01	46810000000
2012-01-01	19549000000
2013-01-01	19742000000
2014-01-01	50392000000