Year | Value | 2022 | 56.643716145521 | 2021 | 66.145396274846 | 2020 | 72.218031462775 | 2019 | 63.724243905537 | 2018 | 61.435504943496 | 2017 | 65.886676790508 | 2016 | 68.689547489443 | 2015 | 70.152528309201 | 2014 | 58.047278359336 | 2013 | 52.185369590657 | 2012 | 48.122003534259 | 2011 | 46.115736296284 | 2010 | 52.483927726843 | 2009 | 58.965796942485 | 2008 | 44.583837509952 | 2007 | 48.515510481623 | 2006 | 48.065620437051 | 2005 | 47.677747662601 | 2004 | 53.247560964314 | 2003 | 58.630393310966 | 2002 | 63.001844012555 | 2001 | 64.670055699522 | 2000 | 62.038907276153 | 1999 | 66.999494920263 | 1998 | 73.874308697244 | 1997 | 68.093335165579 | 1996 | 68.036922452152 | 1995 | 70.079897473486 | 1994 | 71.712353209261 | 1993 | 74.046404169532 | 1992 | 73.914774178905 | 1991 | 78.096913992132 | 1990 | 75.354363649902 | 1989 | 84.886653869594 | 1988 | 84.190748554968 | 1987 | 88.552644313368 | 1986 | 89.623807072113 | 1985 | 85.118238445711 | 1984 | 77.871737096449 | 1983 | 74.857419718538 | 1982 | 62.533087472678 | 1981 | 46.115484511607 | 1980 | 40.935051564729 | 1979 | 53.105603527514 | 1978 | 55.993124770343 | 1977 | 44.542195598851 | 1976 | 33.755270647372 | 1975 | 31.001082325432 | 1974 | 19.335915270259 | 1973 | 34.617623738047 | 1972 | 36.527213972531 | 1971 | 39.969558822548 | 1970 | 48.366950361932 | 1969 | 52.301108262195 | 1968 | 49.350894391365 |
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