| Year | Value | | 2014 | -183.84397043464 | | 2013 | -187.52424332651 | | 2012 | -183.35442850665 | | 2011 | -191.24916174469 | | 2010 | -181.45959229882 | | 2009 | -179.80683983111 | | 2008 | -212.82085015459 | | 2007 | -265.59918776188 | | 2006 | -300.81670896733 | | 2005 | -294.15419284588 | | 2004 | -306.34031775766 | | 2003 | -313.70427890414 | | 2002 | -271.81652636587 | | 2001 | -285.94490695211 | | 2000 | -388.16637497798 | | 1999 | -341.43473399823 | | 1998 | -376.62853117843 | | 1997 | -376.87234946963 | | 1996 | -379.01662977175 | | 1995 | -394.96745876543 | | 1994 | -412.65323150064 | | 1993 | -458.3448798583 | | 1992 | -499.19657173165 | | 1991 | -441.92685402626 | | 1990 | -439.55311153259 | | 1989 | -393.38417484583 | | 1988 | -371.65948238211 | | 1987 | -363.06641795747 | | 1986 | -369.8830031295 | | 1985 | -362.22835960167 | | 1984 | -432.41042381687 | | 1983 | -611.18298292469 | | 1982 | -634.53401018925 | | 1981 | -829.9792278889 | | 1980 | -1,147.4141333021 | | 1979 | -1,612.6515305907 | | 1978 | -1,883.337131137 | | 1977 | -2,365.8041674397 | | 1976 | -3,842.637422654 | | 1975 | -4,258.0166832612 | | 1974 | -6,106.8842184375 | | 1973 | -5,734.5504063807 | | 1972 | -5,588.7293218204 | | 1971 | -5,116.127119649 |
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