Year | Value | 2022 | 55.047528242466 | 2021 | 61.798607745717 | 2020 | 66.572314619877 | 2019 | 61.69110545263 | 2018 | 59.272317159879 | 2017 | 61.513170888002 | 2016 | 63.402967289926 | 2015 | 62.570823145962 | 2014 | 55.893377975387 | 2013 | 53.793454305009 | 2012 | 52.465605871287 | 2011 | 51.844860058572 | 2010 | 51.547272732731 | 2009 | 53.704568357323 | 2008 | 43.389392725484 | 2007 | 43.332320098844 | 2006 | 42.938176840316 | 2005 | 45.211801558956 | 2004 | 52.331429049081 | 2003 | 55.286453360334 | 2002 | 59.471733381268 | 2001 | 58.486496575795 | 2000 | 55.154994017239 | 1999 | 68.381201520105 | 1998 | 72.789259292781 | 1997 | 67.984321711895 | 1996 | 68.505836325587 | 1995 | 71.892898647573 | 1994 | 73.442844436154 | 1993 | 72.264153022315 | 1992 | 67.792407817355 | 1991 | 62.640618177438 | 1990 | 72.903923966265 | 1989 | 79.801558916066 | 1988 | 79.456358740879 | 1987 | 76.583255234965 | 1986 | 76.761263530035 | 1985 | 68.589078392433 | 1984 | 66.591928451289 | 1983 | 60.290974788564 | 1982 | 60.789981106396 | 1981 | 59.299893056688 | 1980 | 56.923076784852 | 1979 | 59.171522388681 | 1978 | 62.413540854687 | 1977 | 64.23901996443 | 1976 | 60.713807700084 | 1975 | 63.869836231541 | 1974 | 56.724199603576 | 1973 | 65.801898894936 | 1972 | 70.974815249587 | 1971 | 73.939911369904 | 1970 | 70.430863653507 | 1969 | 71.929241920004 | 1968 | 73.183694677768 | 1967 | 74.762932783129 | 1966 | 81.343242807727 | 1965 | 80.62519446657 | 1964 | 81.932044024627 | 1963 | 82.564267580074 | 1962 | 67.158797633312 | 1961 | 72.064649964461 | 1960 | 82.734640231548 |
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