Year | Value | 2022 | 69.257309085872 | 2021 | 70.664023053861 | 2020 | 73.974302469112 | 2019 | 71.424787947746 | 2018 | 69.395262701878 | 2017 | 67.584344903243 | 2016 | 67.352607117798 | 2015 | 67.048427458933 | 2014 | 65.747625499009 | 2013 | 65.525900881001 | 2012 | 63.493305547891 | 2011 | 61.238652105386 | 2010 | 60.697755388747 | 2009 | 61.889691761461 | 2008 | 56.210995793228 | 2007 | 56.719421649082 | 2006 | 55.502660929247 | 2005 | 55.660089260419 | 2004 | 56.57781490482 | 2003 | 57.544851696281 | 2002 | 57.968023005483 | 2001 | 58.161716948542 | 2000 | 53.919601796852 | 1999 | 52.566131584897 | 1998 | 51.329776905343 | 1997 | 56.113131886655 | 1996 | 57.135875648322 | 1995 | 60.294957140867 | 1994 | 60.401307677747 | 1993 | 60.91617594109 | 1992 | 63.280949283922 | 1991 | 65.869127616116 | 1990 | 65.596526733904 | 1989 | 64.064504480534 | 1988 | 63.431850167803 | 1987 | 63.048652648455 | 1986 | 67.919099365869 | 1985 | 67.286691622564 | 1984 | 64.531741043369 | 1983 | 67.391119186872 | 1982 | 71.398904135849 | 1981 | 71.197472792599 | 1980 | 67.076236212201 | 1979 | 62.211356195072 | 1978 | 67.766457266536 | 1977 | 68.645640074211 | 1976 | 67.70874132099 | 1975 | 76.168726491134 | 1974 | 71.27482719398 | 1973 | 70.725845217113 | 1972 | 79.824191279888 | 1971 | 77.815515245079 | 1970 | 78.256826443486 | 1969 | 76.207880192548 | 1968 | 80.107896027464 | 1967 | 81.182134808441 | 1966 | 77.948664657591 | 1965 | 77.138121546961 | 1964 | 79.504091852938 | 1963 | 79.242581988548 | 1962 | 80.643055328872 | 1961 | 79.560288560632 | 1960 | 74.343675417661 |
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