Year | Value | 2022 | 48.326771470689 | 2021 | 48.289029161863 | 2020 | 48.218585536637 | 2019 | 48.148468294664 | 2018 | 48.118092151615 | 2017 | 48.104486015969 | 2016 | 48.111018748405 | 2015 | 48.154980780139 | 2014 | 48.195018622 | 2013 | 48.20525530274 | 2012 | 48.213932936429 | 2011 | 48.228655170965 | 2010 | 48.24323464514 | 2009 | 48.281079067515 | 2008 | 48.367219178319 | 2007 | 48.474535062271 | 2006 | 48.578994836451 | 2005 | 48.648754965872 | 2004 | 48.663094464877 | 2003 | 48.655315769951 | 2002 | 48.655841771504 | 2001 | 48.658931387482 | 2000 | 48.662471481565 | 1999 | 48.670053273418 | 1998 | 48.678623267746 | 1997 | 48.695506449893 | 1996 | 48.722924935972 | 1995 | 48.739476304842 | 1994 | 48.752608398354 | 1993 | 48.770310275009 | 1992 | 48.794069013069 | 1991 | 48.83382860957 | 1990 | 48.865399666827 | 1989 | 48.882177367392 | 1988 | 48.90624600399 | 1987 | 48.926614458907 | 1986 | 48.955036204393 | 1985 | 48.987216919727 | 1984 | 49.016849288409 | 1983 | 49.039769539069 | 1982 | 49.064011191888 | 1981 | 49.097635886968 | 1980 | 49.146873281678 | 1979 | 49.206856117904 | 1978 | 49.270828920553 | 1977 | 49.338455250594 | 1976 | 49.397551184346 | 1975 | 49.444208193952 | 1974 | 49.478590146623 | 1973 | 49.49385043583 | 1972 | 49.500898726876 | 1971 | 49.5109329661 | 1970 | 49.521096360941 | 1969 | 49.528668574224 | 1968 | 49.53496554559 | 1967 | 49.536468360947 | 1966 | 49.532399863189 | 1965 | 49.544645981939 | 1964 | 49.574583003309 | 1963 | 49.600954013364 | 1962 | 49.623163261484 | 1961 | 49.645161063951 | 1960 | 49.656210862608 |
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