Year | Value | 2021 | 60.407 | 2020 | 60.472 | 2019 | 61.868 | 2018 | 61.611 | 2017 | 61.176 | 2016 | 60.656 | 2015 | 60.069 | 2014 | 60.006 | 2013 | 59.499 | 2012 | 59.013 | 2011 | 58.263 | 2010 | 57.654 | 2009 | 56.742 | 2008 | 55.85 | 2007 | 54.922 | 2006 | 54.026 | 2005 | 53.077 | 2004 | 52.107 | 2003 | 51.173 | 2002 | 50.139 | 2001 | 49.411 | 2000 | 48.881 | 1999 | 48.245 | 1998 | 47.63 | 1997 | 47.008 | 1996 | 46.184 | 1995 | 45.3 | 1994 | 44.117 | 1993 | 43.283 | 1992 | 42.472 | 1991 | 41.823 | 1990 | 41.564 | 1989 | 41.032 | 1988 | 40.677 | 1987 | 40.325 | 1986 | 40.12 | 1985 | 40.001 | 1984 | 40.017 | 1983 | 40.213 | 1982 | 40.069 | 1981 | 39.831 | 1980 | 39.189 | 1979 | 38.482 | 1978 | 37.7 | 1977 | 36.768 | 1976 | 36.085 | 1975 | 35.516 | 1974 | 35.183 | 1973 | 34.999 | 1972 | 35.092 | 1971 | 34.734 | 1970 | 35.449 | 1969 | 35.696 | 1968 | 35.961 | 1967 | 36.221 | 1966 | 36.184 | 1965 | 36.17 | 1964 | 36.159 | 1963 | 36.142 | 1962 | 36.115 | 1961 | 36 | 1960 | 35.934 |
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