| Year | Value | | 2022 | 122.22227415297 | | 2021 | 113.24119508412 | | 2020 | 111.17102061644 | | 2019 | 110.50160651595 | | 2018 | 109.29210711384 | | 2017 | 107.93536426201 | | 2016 | 107.09529245478 | | 2015 | 108.62452631914 | | 2014 | 108.48221067765 | | 2013 | 108.74186247971 | | 2012 | 107.12793423857 | | 2011 | 104.47388342165 | | 2010 | 100 | | 2009 | 97.963663890992 | | 2008 | 97.002271006813 | | 2007 | 90.847842543528 | | 2006 | 87.009841029523 | | 2005 | 82.576258247314 | | 2004 | 82.231796150141 | | 2003 | 83.816618989531 | | 2002 | 82.832428602699 | | 2001 | 81.300296785746 | | 2000 | 78.665045511634 | | 1999 | 80.663447483833 | | 1998 | 77.296094346092 | | 1997 | 74.042493124426 | | 1996 | 68.206686355124 | | 1995 | 64.368022346871 | | 1994 | 59.406660274429 | | 1993 | 57.424338609936 | | 1992 | 54.282266139861 | | 1991 | 52.641604045504 | | 1990 | 48.052184403183 | | 1989 | 43.425812911889 | | 1988 | 41.533878244523 | | 1987 | 39.907996889755 | | 1986 | 38.429922930875 | | 1985 | 34.660834335732 | | 1984 | 32.887145585076 | | 1983 | 29.561479177596 |
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