Year | Value | 2021 | 62.794 | 2020 | 62.454 | 2019 | 63.939 | 2018 | 63.295 | 2017 | 63.145 | 2016 | 62.599 | 2015 | 62.095 | 2014 | 61.544 | 2013 | 60.952 | 2012 | 60.252 | 2011 | 59.692 | 2010 | 59.041 | 2009 | 58.006 | 2008 | 57.118 | 2007 | 56.133 | 2006 | 55.11 | 2005 | 54.042 | 2004 | 53.007 | 2003 | 51.63 | 2002 | 50.915 | 2001 | 50.197 | 2000 | 49.686 | 1999 | 49.15 | 1998 | 48.668 | 1997 | 47.917 | 1996 | 47.079 | 1995 | 46.154 | 1994 | 45.219 | 1993 | 44.255 | 1992 | 43.325 | 1991 | 42.514 | 1990 | 42.039 | 1989 | 41.311 | 1988 | 40.809 | 1987 | 40.45 | 1986 | 40.054 | 1985 | 39.976 | 1984 | 40.016 | 1983 | 40.414 | 1982 | 40.437 | 1981 | 40.4 | 1980 | 40.063 | 1979 | 39.815 | 1978 | 39.095 | 1977 | 38.416 | 1976 | 37.763 | 1975 | 37.556 | 1974 | 36.722 | 1973 | 36.311 | 1972 | 36.082 | 1971 | 35.757 | 1970 | 36.576 | 1969 | 36.912 | 1968 | 37.16 | 1967 | 37.343 | 1966 | 37.335 | 1965 | 37.244 | 1964 | 37.238 | 1963 | 37.24 | 1962 | 37.078 | 1961 | 37.027 | 1960 | 36.799 |
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