Year | Value | 2022 | 55.847909746507 | 2021 | 56.346232354788 | 2020 | 56.839412349826 | 2019 | 57.328035904154 | 2018 | 57.812115983723 | 2017 | 58.289448393942 | 2016 | 58.760983916267 | 2015 | 59.233159897902 | 2014 | 59.703304293644 | 2013 | 60.167939187156 | 2012 | 60.625272901039 | 2011 | 61.077173886005 | 2010 | 61.549231975426 | 2009 | 62.036495614811 | 2008 | 62.508454443248 | 2007 | 62.975457175822 | 2006 | 63.436870793984 | 2005 | 63.891478074135 | 2004 | 64.339684350799 | 2003 | 64.782611617676 | 2002 | 65.221833517285 | 2001 | 65.669067374582 | 2000 | 66.112150265219 | 1999 | 66.459445368852 | 1998 | 66.800912973796 | 1997 | 67.161141604556 | 1996 | 67.52995495 | 1995 | 67.899852865002 | 1994 | 68.265187101037 | 1993 | 68.629636867373 | 1992 | 68.995687884512 | 1991 | 69.370707043354 | 1990 | 69.741828833638 | 1989 | 70.230689320992 | 1988 | 70.68765837547 | 1987 | 71.127120220416 | 1986 | 71.572416554977 | 1985 | 72.013550535465 | 1984 | 72.446454417288 | 1983 | 72.876001680682 | 1982 | 73.298126844387 | 1981 | 73.712712321606 | 1980 | 74.152267626337 | 1979 | 74.521418651523 | 1978 | 74.944323420663 | 1977 | 75.379819200807 | 1976 | 75.809752732203 | 1975 | 76.261107040728 | 1974 | 76.711010205867 | 1973 | 77.15580176499 | 1972 | 77.586881380344 | 1971 | 77.992931645298 | 1970 | 78.408073050481 | 1969 | 78.735998679851 | 1968 | 79.048033924212 | 1967 | 79.356944392135 | 1966 | 79.660492676695 | 1965 | 79.954654851072 | 1964 | 80.243935929037 | 1963 | 80.5303542093 | 1962 | 80.811849639721 | 1961 | 81.079549634732 | 1960 | 81.399635875808 |
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