Year | Value | 2022 | 68.515181662302 | 2021 | 69.387874875286 | 2020 | 70.419534396684 | 2019 | 70.69161059478 | 2018 | 71.756678222134 | 2017 | 71.740595974914 | 2016 | 72.222301496864 | 2015 | 71.761589683767 | 2014 | 72.897090461915 | 2013 | 73.238921162716 | 2012 | 72.635974701089 | 2011 | 71.414373488595 | 2010 | 71.92863405083 | 2009 | 73.564266617023 | 2008 | 69.79960161219 | 2007 | 69.060060633477 | 2006 | 69.96464710533 | 2005 | 71.441531037142 | 2004 | 71.356451183205 | 2003 | 72.648379853015 | 2002 | 72.585069829306 | 2001 | 71.785627130071 | 2000 | 72.050589850886 | 1999 | 72.900568515527 | 1998 | 72.704694354837 | 1997 | 73.270928246361 | 1996 | 73.872770561133 | 1995 | 73.50586566938 | 1994 | 76.227278617356 | 1993 | 78.230420373804 | 1992 | 76.79631898146 | 1991 | 75.266159974901 | 1990 | 72.780312081274 | 1989 | 72.175169998741 | 1988 | 73.177361581192 | 1987 | 73.919909709371 | 1986 | 73.615801921268 | 1985 | 73.563211231388 | 1984 | 73.479003265779 | 1983 | 75.666835910149 | 1982 | 77.899541409051 | 1981 | 77.259030558827 | 1980 | 75.944372174745 | 1979 | 76.316092659786 | 1978 | 76.648035567108 | 1977 | 76.513794662356 | 1976 | 73.610865312202 | 1975 | 71.488102276001 | 1974 | 72.379618922385 | 1973 | 71.398231164744 | 1972 | 71.860141818092 | 1971 | 71.340500833181 | 1970 | 70.529005161797 | 1969 | 71.288464432096 | 1968 | 71.392603603836 | 1967 | 70.491441351025 | 1966 | 70.240285056728 | 1965 | 69.221551018752 | 1964 | 68.744321238879 | 1963 | 70.682627459095 | 1962 | 70.51948261796 | 1961 | 70.182722424864 | 1960 | 70.766206307852 |
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