Year | Value | 2021 | 61.354 | 2020 | 61.116 | 2019 | 61.554 | 2018 | 61.168 | 2017 | 59.794 | 2016 | 59.556 | 2015 | 58.202 | 2014 | 57.337 | 2013 | 57.26 | 2012 | 56.321 | 2011 | 55.441 | 2010 | 54.49 | 2009 | 53.363 | 2008 | 52.251 | 2007 | 51.037 | 2006 | 49.865 | 2005 | 48.848 | 2004 | 48.235 | 2003 | 47.71 | 2002 | 47.127 | 2001 | 46.602 | 2000 | 45.98 | 1999 | 45.379 | 1998 | 44.685 | 1997 | 44.857 | 1996 | 44.776 | 1995 | 44.282 | 1994 | 44.276 | 1993 | 44.833 | 1992 | 44.896 | 1991 | 44.715 | 1990 | 45.105 | 1989 | 45.096 | 1988 | 45.186 | 1987 | 45.2 | 1986 | 45.029 | 1985 | 45.179 | 1984 | 45.215 | 1983 | 45.17 | 1982 | 44.968 | 1981 | 44.775 | 1980 | 44.535 | 1979 | 44.285 | 1978 | 43.902 | 1977 | 43.458 | 1976 | 43.007 | 1975 | 42.515 | 1974 | 42.022 | 1973 | 41.527 | 1972 | 41.103 | 1971 | 40.6 | 1970 | 40.116 | 1969 | 39.669 | 1968 | 39.215 | 1967 | 38.831 | 1966 | 38.299 | 1965 | 37.807 | 1964 | 37.294 | 1963 | 36.748 | 1962 | 36.236 | 1961 | 35.762 | 1960 | 35.242 |
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