| Year | Value | | 2022 | 68.929844616625 | | 2021 | 73.083156345851 | | 2020 | 74.889308293105 | | 2019 | 74.275021337948 | | 2018 | 75.607213201626 | | 2017 | 78.514974950155 | | 2016 | 81.329733667796 | | 2015 | 82.203127364983 | | 2014 | 83.044658422132 | | 2013 | 84.250051583368 | | 2012 | 85.866357929932 | | 2011 | 88.879133136629 | | 2010 | 87.636529290131 | | 2009 | 82.322605661935 | | 2008 | 85.07859346598 | | 2007 | 83.879019997648 | | 2006 | 84.422435351851 | | 2005 | 88.364337241979 | | 2004 | 89.614928815126 | | 2003 | 88.832528115194 | | 2002 | 89.3392332114 | | 2001 | 90.055433902885 | | 2000 | 94.040790482608 | | 1999 | 94.776483250093 | | 1998 | 100.42741452234 | | 1997 | 95.77303069598 | | 1996 | 103.75916291688 | | 1995 | 100.66685867419 | | 1994 | 101.95704216465 | | 1993 | 105.63062692233 | | 1970 | 89.473680279647 | | 1969 | 89.688246448597 | | 1968 | 87.935659901243 | | 1967 | 86.350146762761 | | 1966 | 86.8750015625 | | 1965 | 87.499998355263 | | 1964 | 85.036496807235 | | 1963 | 85.882348793541 | | 1962 | 90.909087563951 | | 1961 | 88.000003395556 | | 1960 | 87.892371014901 |
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