Year | Value | 2021 | 59.652 | 2020 | 59.999 | 2019 | 60.882 | 2018 | 60.502 | 2017 | 60.066 | 2016 | 59.674 | 2015 | 59.128 | 2014 | 58.61 | 2013 | 58.232 | 2012 | 57.69 | 2011 | 56.967 | 2010 | 56.23 | 2009 | 55.541 | 2008 | 54.646 | 2007 | 54.155 | 2006 | 53.371 | 2005 | 52.249 | 2004 | 52.15 | 2003 | 51.405 | 2002 | 50.986 | 2001 | 50.445 | 2000 | 50.121 | 1999 | 48.006 | 1998 | 47.716 | 1997 | 47.997 | 1996 | 49.065 | 1995 | 48.952 | 1994 | 48.156 | 1993 | 48.228 | 1992 | 47.92 | 1991 | 47.465 | 1990 | 47.084 | 1989 | 46.7 | 1988 | 46.321 | 1987 | 45.785 | 1986 | 45.446 | 1985 | 45.104 | 1984 | 44.829 | 1983 | 44.635 | 1982 | 44.374 | 1981 | 44.07 | 1980 | 43.754 | 1979 | 43.39 | 1978 | 43.033 | 1977 | 42.718 | 1976 | 42.419 | 1975 | 42.053 | 1974 | 41.757 | 1973 | 39.034 | 1972 | 38.698 | 1971 | 38.368 | 1970 | 38.025 | 1969 | 37.746 | 1968 | 37.361 | 1967 | 37.024 | 1966 | 36.698 | 1965 | 36.383 | 1964 | 35.984 | 1963 | 35.661 | 1962 | 37.932 | 1961 | 37.695 | 1960 | 37.464 |
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