Year | Value | 2021 | 10.290697674419 | 2020 | 10.290697674419 | 2019 | 10.290697674419 | 2018 | 10.290697674419 | 2017 | 10.290697674419 | 2016 | 10.290697674419 | 2015 | 10.290697674419 | 2014 | 10.290697674419 | 2013 | 10.290697674419 | 2012 | 10.290697674419 | 2011 | 10.290697674419 | 2010 | 10.290697674419 | 2009 | 10.290697674419 | 2008 | 10.290697674419 | 2007 | 10.290697674419 | 2006 | 10.290697674419 | 2005 | 10.348837209302 | 2004 | 10.348837209302 | 2003 | 10.348837209302 | 2002 | 10.348837209302 | 2001 | 10.348837209302 | 2000 | 10.348837209302 | 1999 | 10.348837209302 | 1998 | 10.348837209302 | 1997 | 10.348837209302 | 1996 | 10.348837209302 | 1995 | 10.348837209302 | 1994 | 10.348837209302 | 1993 | 10.348837209302 | 1992 | 10.406976744186 | 1991 | 10.639534883721 | 1990 | 10.46511627907 | 1989 | 11.162790697674 | 1988 | 10.290697674419 | 1987 | 9.5348837209302 | 1986 | 8.953488372093 | 1985 | 8.953488372093 | 1984 | 9.8255813953488 | 1983 | 7.7325581395349 | 1982 | 7.7325581395349 | 1981 | 7.7906976744186 | 1980 | 10.639534883721 | 1979 | 10.697674418605 | 1978 | 10.930232558139 | 1977 | 8.6627906976744 | 1976 | 9.3604651162791 | 1975 | 9.7093023255814 | 1974 | 9.0116279069767 | 1973 | 9.7674418604651 | 1972 | 9.7674418604651 | 1971 | 8.6627906976744 | 1970 | 8.6627906976744 | 1969 | 8.6627906976744 | 1968 | 8.8953488372093 | 1967 | 8.8953488372093 | 1966 | 8.6627906976744 | 1965 | 8.1395348837209 | 1964 | 7.6744186046512 | 1963 | 7.5 | 1962 | 7.7906976744186 | 1961 | 7.2093023255814 |
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