Year | Value | 2022 | 9.1043798307544 | 2021 | 7.7479140231476 | 2020 | 9.7564063607819 | 2019 | 7.8819887087962 | 2018 | 7.6065336037705 | 2017 | 6.2180938256186 | 2016 | 9.6394134763508 | 2015 | 8.6662698707933 | 2014 | 8.8773533322983 | 2013 | 8.575135040054 | 2012 | 8.097765805736 | 2011 | 8.0928320630299 | 2010 | 6.6987088697813 | 2009 | 7.0622187438857 | 2008 | 7.8770737473089 | 2007 | 8.1146456117931 | 2006 | 6.3976497438513 | 2005 | 4.6992773903564 | 2004 | 9.15760507541 | 2003 | 19.3797301744 | 2002 | 13.972472591352 | 2001 | 4.3593406521727 | 2000 | 4.7638247273325 | 1999 | 5.6586880392791 | 1998 | 10.811070305562 | 1997 | 19.818809318378 | 1996 | 28.342048600431 | 1995 | 42.248319798375 | 1994 | 44.736042152193 | 1993 | 54.100792442519 | 1992 | 68.459193839537 | 1991 | 101.97168320251 | 1990 | 112.52590557302 | 1989 | 80.447436728073 | 1988 | 62.1919564596 | 1987 | 63.566662432672 | 1986 | 76.380636411954 | 1985 | 72.222564428776 | 1984 | 55.304423541876 | 1983 | 49.197379650564 | 1982 | 18.992501295218 | 1981 | 34.045335860947 | 1980 | 63.475830431467 | 1979 | 66.844286185044 | 1978 | 44.548343667239 | 1977 | 58.196175021574 | 1976 | 50.623049560462 | 1975 | 81.405384006742 | 1974 | 77.213413779201 | 1973 | 96.997265318706 | 1972 | 76.484923782881 | 1971 | 23.953088906173 | 1970 | 16.3061449436 | 1969 | 20.966666666 | 1968 | 125.33699112649 | 1967 | 89.275297285038 | 1966 | 73.462693206108 | 1965 | 56.556556556661 | 1964 | 42.369415701519 | 1963 | 21.254695717559 | 1962 | 10.90742438119 | 1961 | 22.747263986796 | 1960 | 38.504037400265 |
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