| Year | Value | | 2022 | 205.26624114623 | | 2021 | 192.37872469902 | | 2020 | 182.98882258443 | | 2019 | 171.62157600338 | | 2018 | 165.4510688995 | | 2017 | 159.18119775209 | | 2016 | 154.05401310539 | | 2015 | 146.79050152257 | | 2014 | 139.92444611392 | | 2013 | 131.18041028234 | | 2012 | 119.23553889708 | | 2011 | 108.91179336483 | | 2010 | 100 | | 2009 | 89.294173377546 | | 2008 | 80.530554239697 | | 2007 | 74.324964471814 | | 2006 | 69.872098531502 | | 2005 | 66.043851255329 | | 2004 | 63.353638086215 | | 2003 | 61.053595452392 | | 2002 | 58.815172903837 | | 2001 | 56.391926101374 | | 2000 | 54.338321648508 | | 1999 | 52.243646139271 | | 1998 | 49.912807674088 | | 1997 | 44.080577451445 | | 1996 | 41.133658455708 | | 1995 | 37.745213169114 | | 1994 | 34.243821411653 | | 1993 | 31.060737091426 | | 1992 | 29.212494552345 | | 1991 | 26.132091425864 | | 1990 | 22.949007579346 | | 1989 | 21.059693510185 | | 1988 | 19.668302700142 | | 1987 | 17.98105542397 | | 1986 | 16.526534343913 | | 1985 | 15.199647560398 | | 1984 | 14.399547607769 | | 1983 | 13.293660350545 | | 1982 | 11.883336333491 | | 1981 | 11.014231643771 | | 1980 | 9.7374092846992 | | 1979 | 8.7451752723828 | | 1978 | 8.228764092847 | | 1977 | 8.0262576977736 | | 1976 | 7.4106224538134 | | 1975 | 8.0231018474657 | | 1974 | 7.586970156324 | | 1973 | 5.8997238275699 | | 1972 | 5.0450510184747 | | 1971 | 4.7397140217906 | | 1970 | 4.5980954997631 | | 1969 | 4.3752940786357 | | 1968 | 4.4010019422075 | | 1967 | 4.2629913311227 | | 1966 | 3.7704831833254 | | 1965 | 3.4029063950734 | | 1964 | 3.1083936049266 | | 1963 | 2.7421696826149 | | 1962 | 2.6636929891047 | | 1961 | 2.5703329701563 | | 1960 | 2.5274866887731 |
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