Year | Value | 2022 | 55.663998594772 | 2021 | 55.951402252636 | 2020 | 56.347500466967 | 2019 | 56.723059226901 | 2018 | 57.072004086269 | 2017 | 57.420211411365 | 2016 | 57.786314086125 | 2015 | 58.161297444242 | 2014 | 58.540075419543 | 2013 | 58.885882994874 | 2012 | 59.229811322668 | 2011 | 59.53326088716 | 2010 | 59.839297472546 | 2009 | 60.199434109385 | 2008 | 60.553615489712 | 2007 | 60.90120339489 | 2006 | 61.129824818273 | 2005 | 61.403098987232 | 2004 | 61.693019685972 | 2003 | 61.968789408362 | 2002 | 62.227733851201 | 2001 | 62.487132403683 | 2000 | 62.774689913784 | 1999 | 62.983491268893 | 1998 | 63.173461817952 | 1997 | 63.36052809592 | 1996 | 63.549745633895 | 1995 | 63.727204431428 | 1994 | 63.866331669092 | 1993 | 64.035332463037 | 1992 | 64.279479977518 | 1991 | 64.525852413249 | 1990 | 64.776625290949 | 1989 | 65.268547735547 | 1988 | 65.679373944534 | 1987 | 66.143710036142 | 1986 | 66.637154348373 | 1985 | 67.123951478804 | 1984 | 67.595880893516 | 1983 | 68.075429278862 | 1982 | 68.505713710648 | 1981 | 68.904560026941 | 1980 | 69.347842019992 | 1979 | 69.730906740609 | 1978 | 70.035477253773 | 1977 | 70.34842731966 | 1976 | 70.747338924815 | 1975 | 71.151141218513 | 1974 | 71.525381207731 | 1973 | 71.90542601064 | 1972 | 72.344020727325 | 1971 | 72.803914477361 | 1970 | 73.266202770564 | 1969 | 73.706156517334 | 1968 | 74.160081080284 | 1967 | 74.615756334732 | 1966 | 75.08125062629 | 1965 | 75.543104725834 | 1964 | 76.007717822697 | 1963 | 76.44706136408 | 1962 | 76.887612767023 | 1961 | 77.320544646653 | 1960 | 77.757430478365 |
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