Year | Value | 2022 | 54.232805023304 | 2021 | 53.694675433274 | 2020 | 53.137441718379 | 2019 | 52.571480433123 | 2018 | 51.99057791942 | 2017 | 51.402400456197 | 2016 | 50.8101252603 | 2015 | 50.213610187363 | 2014 | 49.608296150827 | 2013 | 49.000053611992 | 2012 | 48.398730073276 | 2011 | 47.806335854387 | 2010 | 47.207164168783 | 2009 | 46.58381870727 | 2008 | 45.956486790122 | 2007 | 45.330770149556 | 2006 | 44.711702993313 | 2005 | 44.085871652999 | 2004 | 43.451298613879 | 2003 | 42.822660627773 | 2002 | 42.201858898364 | 2001 | 41.590107293199 | 2000 | 41.029009116724 | 1999 | 40.523168351281 | 1998 | 40.026939791677 | 1997 | 39.532548725138 | 1996 | 39.043195488193 | 1995 | 38.558614235845 | 1994 | 38.078653556768 | 1993 | 37.600024329356 | 1992 | 37.124045642212 | 1991 | 36.645516302721 | 1990 | 36.163285358684 | 1989 | 35.673642876057 | 1988 | 35.188411185502 | 1987 | 34.6896045869 | 1986 | 34.188765590664 | 1985 | 33.683359543943 | 1984 | 33.175189556098 | 1983 | 32.667148479083 | 1982 | 32.174255166635 | 1981 | 31.639491975657 | 1980 | 31.066718797763 | 1979 | 30.499432815949 | 1978 | 29.940360773218 | 1977 | 29.472263164753 | 1976 | 29.096826198632 | 1975 | 28.724973355602 | 1974 | 28.414344826286 | 1973 | 28.056705857008 | 1972 | 27.742591839839 | 1971 | 27.462736460371 | 1970 | 27.217425436746 | 1969 | 26.99641357412 | 1968 | 26.773153569175 | 1967 | 26.543736869715 | 1966 | 26.313466946797 | 1965 | 26.098762411205 | 1964 | 25.876291480956 | 1963 | 25.420324845097 | 1962 | 24.972650859982 | 1961 | 24.491044064179 | 1960 | 23.983688288936 |
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