Year | Value | 2022 | 63.517270718631 | 2021 | 65.301173218231 | 2020 | 67.354387756337 | 2019 | 55.930080330358 | 2018 | 57.646019692646 | 2017 | 56.106628381708 | 2016 | 57.400223754862 | 2015 | 55.270158309841 | 2014 | 64.390168622524 | 2013 | 68.558924347647 | 2012 | 78.363271227728 | 2011 | 79.344080703049 | 2010 | 78.403998127355 | 2009 | 83.136006974122 | 2008 | 84.929114809935 | 2007 | 72.016580711946 | 2006 | 81.08263440929 | 2005 | 73.220301192541 | 2004 | 74.343869305097 | 2003 | 76.42561611224 | 2002 | 72.11868558921 | 2001 | 79.359759133709 | 2000 | 76.478917523279 | 1999 | 73.018562299785 | 1998 | 79.595421249621 | 1997 | 77.579625065713 | 1996 | 68.998583420794 | 1995 | 75.314587846667 | 1994 | 74.516808321162 | 1993 | 79.812603695903 | 1992 | 80.737067366346 | 1991 | 79.674086764032 | 1990 | 77.709415209857 | 1989 | 69.49618714384 | 1988 | 66.726121516136 | 1987 | 67.430264558129 | 1986 | 68.748131501836 | 1985 | 70.790793542935 | 1984 | 73.411949428813 | 1983 | 85.870857575982 | 1982 | 88.984294083274 | 1981 | 81.15125295297 | 1980 | 71.795432573347 | 1979 | 73.085990817719 | 1978 | 57.969065232011 | 1977 | 63.990267639903 | 1976 | 77.079828772275 |
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