| Year | Value | | 2022 | 101.51628650932 | | 2021 | 97.767343112128 | | 2020 | 96.401151718132 | | 2019 | 96.674140768214 | | 2018 | 97.596442841084 | | 2017 | 97.136715066422 | | 2016 | 96.711821320935 | | 2015 | 96.986217457887 | | 2014 | 97.104464922574 | | 2013 | 97.601093237376 | | 2012 | 98.896235172687 | | 2011 | 101.40058946267 | | 2010 | 101.8580824654 | | 2009 | 100.62044465961 | | 2008 | 100.76732640923 | | 2007 | 100.3393773178 | | 2006 | 100.82120231846 | | 2005 | 100.09882599856 | | 2004 | 99.41067355037 | | 2003 | 99.54445895341 | | 2002 | 99.242989622212 | | 2001 | 98.736781294723 | | 2000 | 99.150125624953 | | 1999 | 98.219315925335 | | 1998 | 96.966833650011 | | 1997 | 96.288934032848 | | 1996 | 95.469324325991 | | 1995 | 96.339575116732 | | 1994 | 96.7330340373 | | 1993 | 96.993659075269 | | 1992 | 100.11896136592 | | 1991 | 99.963720105272 | | 1990 | 99.95830673393 | | 1989 | 100.18408267877 | | 1988 | 100.11776830189 | | 1987 | 99.741367837923 | | 1986 | 98.865562982397 | | 1985 | 100.58991952868 | | 1984 | 100.60487876899 | | 1983 | 99.66499515637 | | 1982 | 101.48256754735 | | 1981 | 102.19357082768 | | 1980 | 102.87142389693 | | 1979 | 99.052212948716 | | 1978 | 97.978921191455 | | 1977 | 99.169040872113 | | 1976 | 101.30818018491 | | 1975 | 100.09519785484 | | 1974 | 104.07367117011 | | 1973 | 102.0981627443 | | 1972 | 99.325608395111 | | 1971 | 99.368704879551 | | 1970 | 99.925327849344 |
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