Year | Value | 2021 | 59.711 | 2020 | 59.465 | 2019 | 60.339 | 2018 | 59.821 | 2017 | 59.764 | 2016 | 59.088 | 2015 | 58.226 | 2014 | 58.35 | 2013 | 57.776 | 2012 | 57.086 | 2011 | 56.396 | 2010 | 55.714 | 2009 | 54.772 | 2008 | 53.963 | 2007 | 53.279 | 2006 | 52.291 | 2005 | 51.387 | 2004 | 50.374 | 2003 | 49.072 | 2002 | 47.902 | 2001 | 46.127 | 2000 | 45.272 | 1999 | 45.699 | 1998 | 44.621 | 1997 | 43.521 | 1996 | 42.435 | 1995 | 42.257 | 1994 | 42.521 | 1993 | 34.984 | 1992 | 42.474 | 1991 | 42.539 | 1990 | 43.011 | 1989 | 43.785 | 1988 | 40.601 | 1987 | 45.73 | 1986 | 46.503 | 1985 | 46.971 | 1984 | 47.009 | 1983 | 46.667 | 1982 | 45.88 | 1981 | 44.923 | 1980 | 43.897 | 1979 | 43.144 | 1978 | 42.368 | 1977 | 42.114 | 1976 | 41.837 | 1975 | 41.796 | 1974 | 41.741 | 1973 | 35.36 | 1972 | 23.209 | 1971 | 41.625 | 1970 | 41.69 | 1969 | 41.379 | 1968 | 41.98 | 1967 | 41.912 | 1966 | 42.155 | 1965 | 40.087 | 1964 | 42.543 | 1963 | 42.358 | 1962 | 42.102 | 1961 | 41.804 | 1960 | 41.533 |
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