| Year | Value | | 2022 | 111.73862217226 | | 2021 | 101.90921373439 | | 2020 | 100.67710217839 | | 2019 | 101.94941410163 | | 2018 | 101.69212537511 | | 2017 | 101.05987316816 | | 2016 | 99.939299257663 | | 2015 | 100.77132168423 | | 2014 | 102.55150093159 | | 2013 | 103.91513873292 | | 2012 | 104.88137883937 | | 2011 | 103.32985323351 | | 2010 | 100 | | 2009 | 95.499136144313 | | 2008 | 94.357343695379 | | 2007 | 90.595112507544 | | 2006 | 88.046172969253 | | 2005 | 85.319409980831 | | 2004 | 82.398329276899 | | 2003 | 80.077018151603 | | 2002 | 77.346194520026 | | 2001 | 74.637337793351 | | 2000 | 72.201289168626 | | 1999 | 69.995600662291 | | 1998 | 68.197483272101 | | 1997 | 65.094912793535 | | 1996 | 61.680290278264 | | 1995 | 57.00868392869 | | 1994 | 52.332985893854 | | 1993 | 47.200380767515 | | 1992 | 41.255011905445 | | 1991 | 35.60239360148 | | 1990 | 29.803810277657 | | 1989 | 24.747109814163 | | 1988 | 21.773777693765 | | 1987 | 19.179068666491 | | 1986 | 16.477307158651 | | 1985 | 13.394502112336 | | 1984 | 11.226196692302 | | 1983 | 9.4770375705387 | | 1982 | 7.8857367904027 | | 1981 | 6.5176178512115 | | 1980 | 5.234779297878 | | 1979 | 4.1987100561601 | | 1978 | 3.5255377245872 | | 1977 | 3.131795111927 | | 1976 | 2.7870434877515 | | 1975 | 2.4658803410178 | | 1974 | 2.1701198731224 | | 1973 | 1.7146850164558 | | 1972 | 1.4860602357316 | | 1971 | 1.4243679917253 | | 1970 | 1.3790059933163 | | 1969 | 1.3409019750591 | | 1968 | 1.3064264434921 | | 1967 | 1.3046122420958 | | 1966 | 1.2810240163467 | | 1965 | 1.221146141532 | | 1964 | 1.183041871582 | | 1963 | 1.1757837236351 | | 1962 | 1.1394946618525 | | 1961 | 1.1449380211199 | | 1960 | 1.1213495436781 |
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