| Year | Value | | 2014 | -54.77227438173 | | 2013 | -62.074226927438 | | 2012 | -71.642665115669 | | 2011 | -78.698972145162 | | 2010 | -93.725704490368 | | 2009 | -92.610492300733 | | 2008 | -101.67729081683 | | 2007 | -110.38875380894 | | 2006 | -114.09581148702 | | 2005 | -116.40570479188 | | 2004 | -124.85391390746 | | 2003 | -128.64597379445 | | 2002 | -130.0700093898 | | 2001 | -136.85421883992 | | 2000 | -157.57214859972 | | 1999 | -152.06610526541 | | 1998 | -153.89991887256 | | 1997 | -134.47943195584 | | 1996 | -135.3187303379 | | 1995 | -134.04458310776 | | 1994 | -135.94220856875 | | 1993 | -146.42599305554 | | 1992 | -154.33271823906 | | 1991 | -161.50743571004 | | 1990 | -204.44587947202 | | 1989 | -212.15034458651 | | 1988 | -215.24181281213 | | 1987 | -190.13083995184 | | 1986 | -159.96005986655 | | 1985 | -174.00839034802 | | 1984 | -178.72673740184 | | 1983 | -199.77394778987 | | 1982 | -192.07258681309 | | 1981 | -183.74561617333 | | 1980 | -331.83101148704 | | 1979 | -501.62802061825 | | 1978 | -644.42344033026 | | 1977 | -685.09573619827 | | 1976 | -765.59956409892 | | 1975 | -770.8778852474 | | 1974 | -870.73607562482 | | 1973 | -1,056.2381136071 | | 1972 | -1,078.6746459734 | | 1971 | -1,121.0314083141 |
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