| Year | Value | | 2022 | 106.47970598605 | | 2021 | 102.69810471103 | | 2020 | 100.94825366582 | | 2019 | 99.026816572107 | | 2018 | 99.415054299218 | | 2017 | 98.406338363494 | | 2016 | 99.662590949652 | | 2015 | 99.941120121148 | | 2014 | 100.4315751279 | | 2013 | 100.64000937492 | | 2012 | 100.24983196317 | | 2011 | 100.13791156317 | | 2010 | 100 | | 2009 | 99.644399894991 | | 2008 | 98.622944559796 | | 2007 | 96.608672824038 | | 2006 | 95.682680604282 | | 2005 | 95.529939619579 | | 2004 | 94.355741745541 | | 2003 | 93.593679549146 | | 2002 | 93.313738334144 | | 2001 | 95.525118485646 | | 2000 | 94.959265329232 | | 1999 | 93.502356052948 | | 1998 | 93.892599609096 | | 1997 | 94.30885940232 | | 1996 | 92.721868940653 | | 1995 | 90.907236404567 | | 1994 | 85.788541759765 | | 1993 | 83.726754971453 | | 1992 | 80.312123855162 | | 1991 | 79.297490609178 | | 1990 | 78.048711229506 | | 1989 | 76.414463425808 | | 1988 | 75.430621549023 | | 1987 | 74.541459016028 | | 1986 | 73.623481030576 | | 1985 | 72.335018656375 | | 1984 | 70.67195540022 | | 1983 | 68.564310877566 | | 1982 | 67.773944181571 | | 1981 | 63.723314864597 | | 1980 | 58.388339666631 | | 1977 | 49.397918499687 |
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