Year | Value | 2022 | 47.607730743657 | 2021 | 48.095550627031 | 2020 | 48.599844921456 | 2019 | 49.110824646287 | 2018 | 49.63405272698 | 2017 | 50.165346755597 | 2016 | 50.703742060635 | 2015 | 51.247420371976 | 2014 | 51.798511895771 | 2013 | 52.344534708306 | 2012 | 52.882905183292 | 2011 | 53.413293694575 | 2010 | 53.953165486021 | 2009 | 54.520036206765 | 2008 | 55.089936307283 | 2007 | 55.660983976904 | 2006 | 56.216231000997 | 2005 | 56.783273878655 | 2004 | 57.358920032551 | 2003 | 57.928073454155 | 2002 | 58.488189479053 | 2001 | 59.043279747605 | 2000 | 59.558829421909 | 1999 | 60.024126876459 | 1998 | 60.481484477939 | 1997 | 60.938505193831 | 1996 | 61.38886089395 | 1995 | 61.831992375824 | 1994 | 62.279692144677 | 1993 | 62.729345591558 | 1992 | 63.174523940918 | 1991 | 63.623250884006 | 1990 | 64.081365726009 | 1989 | 64.537389545902 | 1988 | 65.006433001645 | 1987 | 65.491787908952 | 1986 | 65.9795957764 | 1985 | 66.472607735489 | 1984 | 66.967640320285 | 1983 | 67.460484080646 | 1982 | 67.936188020144 | 1981 | 68.451207264302 | 1980 | 69.006351954462 | 1979 | 69.554926965119 | 1978 | 70.091458251557 | 1977 | 70.546863415329 | 1976 | 70.917818843442 | 1975 | 71.284125830231 | 1974 | 71.594358401467 | 1973 | 71.947374188609 | 1972 | 72.262611069472 | 1971 | 72.546879641471 | 1970 | 72.796822720191 | 1969 | 73.026085895418 | 1968 | 73.259183096181 | 1967 | 73.498484668161 | 1966 | 73.739941386152 | 1965 | 73.966876977177 | 1964 | 74.201196892822 | 1963 | 74.650848363362 | 1962 | 75.092785590407 | 1961 | 75.564548869541 | 1960 | 76.063361290897 |
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