Year	US Dollars, Sum Over Component Sub-periods
1975-01-01	1190000000.00
1976-01-01	1372000000.00
1977-01-01	1687000000.00
1978-01-01	1882000000.00
1979-01-01	2210200000.00
1980-01-01	1543700000.00
1981-01-01	2314700000.00
1982-01-01	2739500000.00
1983-01-01	1137800000.00
1984-01-01	1459200000.00
1985-01-01	1337300000.00
1986-01-01	173551000.00
1987-01-01	1030758000.00
1988-01-01	2629500000.00
1989-01-01	606800000.00
1990-01-01	364200000.00
1991-01-01	87200000.00
1992-01-01	1924300000.00
1993-01-01	798600000.00
1994-01-01	1460000000.00
1995-01-01	3309484000.00
1996-01-01	11260751000.00
1997-01-01	17877370311.00
1998-01-01	26001596916.00
1999-01-01	26888017615.00
2000-01-01	30497652700.00
2001-01-01	24714939372.00
2002-01-01	14108096193.00
2003-01-01	9894224671.00
2004-01-01	8338896461.00
2005-01-01	12549590734.00
2006-01-01	-9380283047.00
2007-01-01	27518241270.60
2008-01-01	24601090272.00
2009-01-01	36032805800.00
2010-01-01	36918923577.00
2011-01-01	67689141253.23
2012-01-01	68093253955.70
2013-01-01	67490979276.90