Year | Value | 2022 | 65.024342595152 | 2021 | 69.321622849814 | 2020 | 71.01144825189 | 2019 | 71.077376248247 | 2018 | 71.256099702497 | 2017 | 70.77157461078 | 2016 | 71.541466824284 | 2015 | 72.580665099655 | 2014 | 72.94661426813 | 2013 | 73.701693337352 | 2012 | 74.513587201253 | 2011 | 74.478549101986 | 2010 | 74.978078572097 | 2009 | 76.41455397444 | 2008 | 72.492543744466 | 2007 | 71.824949515233 | 2006 | 71.608351489705 | 2005 | 72.289058219289 | 2004 | 72.659568670428 | 2003 | 72.283161279889 | 2002 | 71.804962068472 | 2001 | 71.034378287036 | 2000 | 70.937848617823 | 1999 | 73.112567002475 | 1998 | 74.270849053882 | 1997 | 73.580793613538 | 1996 | 74.27280055163 | 1995 | 74.604268326743 | 1994 | 75.342272781189 | 1993 | 75.094644109827 | 1992 | 74.153633643735 | 1991 | 74.169952893486 | 1990 | 73.645501389432 | 1989 | 74.881723876217 | 1988 | 75.466612304094 | 1987 | 75.923456065919 | 1986 | 76.414462529329 | 1985 | 77.125262536329 | 1984 | 77.720462018207 | 1983 | 79.426145096367 | 1982 | 80.820035699705 | 1981 | 81.579607823778 | 1980 | 80.325889813221 | 1979 | 79.263878508036 | 1978 | 79.081174937235 | 1977 | 79.161134646255 | 1976 | 79.117544053734 | 1975 | 78.488372775477 | 1974 | 76.412955925855 | 1973 | 74.35653103673 | 1972 | 73.7011369637 | 1971 | 76.113130345109 | 1970 | 76.086495040695 | 1969 | 75.037981211722 | 1968 | 76.339081689176 | 1967 | 76.917925767285 | 1966 | 75.928425922258 |
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