Year | Value | 2021 | 70.836 | 2020 | 68.648 | 2019 | 71.066 | 2018 | 70.964 | 2017 | 70.686 | 2016 | 70.344 | 2015 | 70.005 | 2014 | 69.77 | 2013 | 69.612 | 2012 | 69.484 | 2011 | 69.263 | 2010 | 68.854 | 2009 | 68.296 | 2008 | 67.492 | 2007 | 66.54 | 2006 | 65.73 | 2005 | 64.985 | 2004 | 64.498 | 2003 | 64.3 | 2002 | 64.256 | 2001 | 64.284 | 2000 | 64.282 | 1999 | 64.153 | 1998 | 62.661 | 1997 | 63.504 | 1996 | 63.032 | 1995 | 62.579 | 1994 | 62.079 | 1993 | 61.584 | 1992 | 61.173 | 1991 | 60.834 | 1990 | 59.766 | 1989 | 59.128 | 1988 | 55.914 | 1987 | 51.955 | 1986 | 52.582 | 1985 | 50.946 | 1984 | 50.727 | 1983 | 52.144 | 1982 | 55.605 | 1981 | 55.204 | 1980 | 55.074 | 1979 | 44.569 | 1978 | 49.239 | 1977 | 53.392 | 1976 | 53.863 | 1975 | 53.68 | 1974 | 53.531 | 1973 | 53.4 | 1972 | 47.339 | 1971 | 52.96 | 1970 | 52.593 | 1969 | 52.032 | 1968 | 51.301 | 1967 | 50.415 | 1966 | 49.551 | 1965 | 48.65 | 1964 | 47.813 | 1963 | 47.072 | 1962 | 46.411 | 1961 | 45.811 | 1960 | 44.994 |
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