Year | Value | 2014 | -8.9930802289109 | 2013 | -9.1721129606336 | 2012 | -11.721424125721 | 2011 | -108.7502665491 | 2010 | -109.73256510759 | 2009 | -115.54330880552 | 2008 | -115.97204230013 | 2007 | -124.76928147448 | 2006 | -81.423060189444 | 2005 | -80.333011655508 | 2004 | -83.921734838704 | 2003 | -73.139857172761 | 2002 | -61.848657956794 | 2001 | -59.7363132208 | 2000 | -50.190988401806 | 1999 | -2.5246036857307 | 1998 | 10.464297940748 | 1997 | 12.145508776738 | 1996 | 12.127310927725 | 1995 | 13.184376989137 | 1994 | 13.752496868101 | 1993 | 11.116268363607 | 1992 | 14.837843479429 | 1991 | 16.083952733369 | 1990 | 17.448605695831 | 1989 | 14.00474739563 | 1988 | 15.423020772923 | 1987 | 11.648514712734 | 1986 | 14.614138417875 | 1985 | 15.163943082923 | 1984 | 13.539701772398 | 1983 | 14.22006853783 | 1982 | 15.305447949159 | 1981 | 13.800041557617 | 1980 | 15.256257378103 | 1979 | 12.572047975211 | 1978 | 14.139949910758 | 1977 | 15.18985057318 | 1976 | 14.954333776632 | 1975 | 17.221247487776 | 1974 | 18.814881193892 | 1973 | 19.745316318219 | 1972 | 19.062271679088 | 1971 | 19.354986968234 |
|