Year | Value | 2022 | 50.901732763271 | 2021 | 50.894834554608 | 2020 | 50.892702331594 | 2019 | 50.89797131179 | 2018 | 50.910774558472 | 2017 | 50.929636883642 | 2016 | 50.951805485238 | 2015 | 50.980831718789 | 2014 | 51.01245748284 | 2013 | 51.041041618586 | 2012 | 51.068706220758 | 2011 | 51.092585174961 | 2010 | 51.115436194125 | 2009 | 51.136969589506 | 2008 | 51.155691372887 | 2007 | 51.175651577426 | 2006 | 51.193864433172 | 2005 | 51.208793028614 | 2004 | 51.225997850903 | 2003 | 51.241090480313 | 2002 | 51.252217932412 | 2001 | 51.267182768691 | 2000 | 51.287855240192 | 1999 | 51.311327466314 | 1998 | 51.336621478576 | 1997 | 51.364578571691 | 1996 | 51.395913714204 | 1995 | 51.434170151961 | 1994 | 51.481418130414 | 1993 | 51.550492242825 | 1992 | 51.632898344019 | 1991 | 51.709097698567 | 1990 | 51.790096966051 | 1989 | 51.817391149921 | 1988 | 51.712843111028 | 1987 | 51.538893702199 | 1986 | 51.369911572947 | 1985 | 51.208998507203 | 1984 | 51.06103459722 | 1983 | 51.009148021209 | 1982 | 51.051208825713 | 1981 | 51.093623779819 | 1980 | 51.130916726742 | 1979 | 51.168947339632 | 1978 | 51.209359043228 | 1977 | 51.250018311025 | 1976 | 51.2914542683 | 1975 | 51.330769116091 | 1974 | 51.363983966289 | 1973 | 51.394159282431 | 1972 | 51.425909340238 | 1971 | 51.45983853637 | 1970 | 51.494504678449 | 1969 | 51.530372003457 | 1968 | 51.569730193989 | 1967 | 51.61152047013 | 1966 | 51.651992913886 | 1965 | 51.693104111516 | 1964 | 51.737852366748 | 1963 | 51.782233656668 | 1962 | 51.826333072423 | 1961 | 51.87094013175 | 1960 | 51.911636657298 |
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