| Year | Value | | 2021 | 139.55771345006 | | 2020 | 111.966489927 | | 2019 | 108.5906700733 | | 2018 | 111.79471833511 | | 2017 | 113.40069924566 | | 2016 | 115.87127964486 | | 2015 | 109.54045447619 | | 2014 | 131.99657387438 | | 2013 | 114.69293888887 | | 2012 | 107.15141485076 | | 2011 | 90.32649597875 | | 2010 | 79.21769387871 | | 2009 | 83.909303151301 | | 2008 | 82.407947517626 | | 2007 | 78.796321130145 | | 2006 | 74.662535536294 | | 2005 | 75.031232616278 | | 2004 | 75.54959345358 | | 2003 | 73.887203338786 | | 2002 | 71.816168709094 | | 2001 | 73.250219710721 | | 2000 | 75.797763267129 | | 1999 | 80.909470486832 | | 1998 | 79.815268380809 | | 1997 | 80.529769880454 | | 1996 | 82.657337191344 | | 1995 | 79.662331976006 | | 1994 | 82.371700510372 | | 1993 | 87.065292262329 | | 1992 | 88.201436913059 | | 1991 | 89.697461837696 | | 1990 | 83.066619957664 | | 1989 | 83.847155467897 | | 1988 | 95.2511999656 | | 1987 | 95.089733149587 | | 1986 | 88.525311959012 | | 1985 | 89.438269750676 | | 1984 | 87.577977754772 | | 1983 | 89.53077458351 | | 1982 | 87.00936209804 | | 1981 | 93.782021071195 | | 1980 | 89.190559781549 | | 1979 | 90.229383691692 | | 1978 | 88.548581308469 | | 1977 | 86.517602635768 | | 1976 | 82.8432760364 | | 1975 | 87.109773267952 | | 1974 | 90.041022404544 | | 1973 | 85.528851029307 | | 1972 | 87.960554833117 | | 1971 | 90.490453013853 | | 1970 | 90.235294117647 | | 1969 | 88.115247322884 | | 1968 | 88.586060611169 | | 1967 | 90.373073300789 | | 1966 | 92.625777461674 | | 1965 | 89.153572714919 | | 1964 | 90.554782914963 | | 1963 | 88.85661107461 | | 1962 | 83.34753827128 | | 1961 | 90.300217761527 | | 1960 | 92.856933497098 |
|