Year | Value | 2022 | 58.615 | 2021 | 57.985 | 2020 | 57.349 | 2019 | 56.707 | 2018 | 56.06 | 2017 | 55.407 | 2016 | 54.749 | 2015 | 54.086 | 2014 | 53.419 | 2013 | 52.748 | 2012 | 52.073 | 2011 | 51.394 | 2010 | 50.713 | 2009 | 50.031 | 2008 | 49.351 | 2007 | 48.669 | 2006 | 47.988 | 2005 | 47.308 | 2004 | 46.63 | 2003 | 45.951 | 2002 | 45.275 | 2001 | 44.601 | 2000 | 43.929 | 1999 | 43.184 | 1998 | 42.418 | 1997 | 41.654 | 1996 | 40.896 | 1995 | 40.14 | 1994 | 39.39 | 1993 | 38.644 | 1992 | 37.905 | 1991 | 37.17 | 1990 | 36.441 | 1989 | 35.719 | 1988 | 35.004 | 1987 | 34.293 | 1986 | 33.591 | 1985 | 32.896 | 1984 | 32.209 | 1983 | 31.842 | 1982 | 31.614 | 1981 | 31.388 | 1980 | 31.163 | 1979 | 30.938 | 1978 | 30.714 | 1977 | 30.492 | 1976 | 30.27 | 1975 | 30.049 | 1974 | 29.829 | 1973 | 29.61 | 1972 | 29.392 | 1971 | 29.174 | 1970 | 28.958 | 1969 | 28.473 | 1968 | 27.86 | 1967 | 27.254 | 1966 | 26.656 | 1965 | 26.067 | 1964 | 25.488 | 1963 | 24.915 | 1962 | 24.352 | 1961 | 23.797 | 1960 | 23.252 |
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