Year | Value | 2022 | 68.334727539865 | 2021 | 68.16625507215 | 2020 | 67.973021793516 | 2019 | 67.78952201624 | 2018 | 67.603501841391 | 2017 | 67.424584716716 | 2016 | 67.252604449484 | 2015 | 67.085847074697 | 2014 | 66.924656347178 | 2013 | 66.767897204256 | 2012 | 66.613548665024 | 2011 | 66.45964286517 | 2010 | 66.299740274922 | 2009 | 66.120682311019 | 2008 | 65.927066712179 | 2007 | 65.733562006057 | 2006 | 65.539893382591 | 2005 | 65.347596287999 | 2004 | 65.156657609759 | 2003 | 64.971263045813 | 2002 | 64.796927273793 | 2001 | 64.65098344566 | 2000 | 64.529699262808 | 1999 | 64.427078924288 | 1998 | 64.330806983359 | 1997 | 64.245018147942 | 1996 | 64.172494075403 | 1995 | 64.105347690406 | 1994 | 64.017778821608 | 1993 | 63.931373000158 | 1992 | 63.844094963946 | 1991 | 63.765130379889 | 1990 | 63.663723508087 | 1989 | 63.495403042619 | 1988 | 63.166294477819 | 1987 | 62.708499486791 | 1986 | 62.248152939154 | 1985 | 61.760833891829 | 1984 | 61.219777466993 | 1983 | 60.661889169317 | 1982 | 60.112798351503 | 1981 | 59.559470450989 | 1980 | 59.04463188857 | 1979 | 58.644594185394 | 1978 | 58.154417513547 | 1977 | 57.5856323097 | 1976 | 57.011312108354 | 1975 | 56.414867016482 | 1974 | 55.794136893266 | 1973 | 55.148263512189 | 1972 | 54.495963166764 | 1971 | 53.837432167703 | 1970 | 53.153218515642 | 1969 | 52.426273681767 | 1968 | 51.689166306108 | 1967 | 50.949070570328 | 1966 | 50.207869019163 | 1965 | 49.466079994623 | 1964 | 48.709461300597 | 1963 | 47.969056838148 | 1962 | 47.228986401186 | 1961 | 46.488122093896 | 1960 | 45.742475067758 |
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