| Year | Value | | 2013 | -178.77487021429 | | 2012 | -166.05223799363 | | 2011 | -196.00751066814 | | 2010 | -173.39405785473 | | 2009 | -207.29313914376 | | 2008 | -209.08443580162 | | 2007 | -242.73917059041 | | 2006 | -260.94560995106 | | 2005 | -296.28043059229 | | 2004 | -287.02958915115 | | 2003 | -238.03170307143 | | 2002 | -253.32925421336 | | 2001 | -299.87052646978 | | 2000 | -321.07209412503 | | 1999 | -313.58490847393 | | 1998 | -333.06745812798 | | 1997 | -361.04215712766 | | 1996 | -334.90331380855 | | 1995 | -310.86721972301 | | 1994 | -256.24259280104 | | 1993 | -296.14673472563 | | 1992 | -249.5355192456 | | 1991 | -288.14044070798 | | 1990 | -265.83634185723 | | 1989 | -240.22943210594 | | 1988 | -245.61036564262 | | 1987 | -220.49223133709 | | 1986 | -215.23863206503 | | 1985 | -208.8210309215 | | 1984 | -226.45898487106 | | 1983 | -212.56289282418 | | 1982 | -252.22124940759 | | 1981 | -282.24021443296 | | 1980 | -320.76353831445 | | 1979 | -415.51140073236 | | 1978 | -387.47437811607 | | 1977 | -443.01205013886 | | 1976 | -489.29504466137 | | 1975 | -519.52804703122 | | 1974 | -695.81871634374 | | 1973 | -955.40110892545 | | 1972 | -1,002.3549463603 | | 1971 | -1,066.7819412987 |
|