Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	1190000000
1981-01-01	1872200000
1982-01-01	2920100000
1983-01-01	2441400000
1984-01-01	2254400000
1985-01-01	1569100000
1986-01-01	2084400000
1987-01-01	3478600000
1988-01-01	2752900000
1989-01-01	820500000
1990-01-01	-104900000
1991-01-01	-1618500000
1992-01-01	-2493200000
1993-01-01	-1486200000
1994-01-01	-1119400000
1995-01-01	-2269000000
1996-01-01	-5588000000
1997-01-01	-2571500000
1998-01-01	1772700000
1999-01-01	-57300000
2000-01-01	-2159800000
2001-01-01	-3033700000
2002-01-01	-6506000000
2003-01-01	-5860500000
2004-01-01	-5830300000
2005-01-01	-9827200000
2006-01-01	-13350800000
2007-01-01	-12175100000
2008-01-01	-5315000000
2009-01-01	-6012000000
2010-01-01	-8474900000
2011-01-01	-5970300000
2012-01-01	5811600000
2013-01-01	6240700000