Year | Value | 2014 | -8.1921038727688 | 2013 | -7.4933499899135 | 2012 | 2.8754404314622 | 2011 | 5.3068214860603 | 2010 | 45.907996480055 | 2009 | 44.882796993402 | 2008 | 42.052943803024 | 2007 | 45.531185361085 | 2006 | 42.454217770618 | 2005 | 37.577136277928 | 2004 | 36.772329080865 | 2003 | 37.01525620705 | 2002 | 36.567656502848 | 2001 | 32.358632957195 | 2000 | 28.961806879968 | 1999 | 26.561077718707 | 1998 | 26.797438563163 | 1997 | 20.783857690815 | 1996 | 19.169195118188 | 1995 | 18.832460451434 | 1994 | 17.072772293002 | 1993 | 16.301499154794 | 1992 | 14.734374187154 | 1991 | 15.298106188458 | 1990 | 16.999005676207 | 1989 | 17.567215562845 | 1988 | 14.762995336247 | 1987 | 19.502045418172 | 1986 | 16.184918093352 | 1985 | 18.378723776774 | 1984 | 15.059643021057 | 1983 | 10.37878121409 | 1982 | 21.040956412151 | 1981 | 19.778173127016 | 1980 | 17.855704868129 | 1979 | 17.962318842063 | 1978 | 21.984479190115 | 1977 | 22.506473793451 | 1976 | 20.368400474425 | 1975 | 22.857369263811 | 1974 | 21.794401167666 | 1973 | 21.972327594303 | 1972 | 21.975839464858 | 1971 | 21.997565767496 |
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