Year | Value | 2021 | 31.087 | 2020 | 31.605 | 2019 | 32.093 | 2018 | 32.657 | 2017 | 33.285 | 2016 | 34.502 | 2015 | 35.519 | 2014 | 36.472 | 2013 | 37.46 | 2012 | 37.945 | 2011 | 38.303 | 2010 | 38.427 | 2009 | 39.1 | 2008 | 40.003 | 2007 | 40.911 | 2006 | 41.032 | 2005 | 41.358 | 2004 | 41.655 | 2003 | 42.048 | 2002 | 42.257 | 2001 | 42.132 | 2000 | 42.493 | 1999 | 42.727 | 1998 | 43.028 | 1997 | 43.352 | 1996 | 43.461 | 1995 | 43.709 | 1994 | 44.008 | 1993 | 44.064 | 1992 | 44.179 | 1991 | 44.112 | 1990 | 44.462 | 1989 | 45.625 | 1988 | 46.051 | 1987 | 46.539 | 1986 | 47.074 | 1985 | 47.616 | 1984 | 48.103 | 1983 | 48.489 | 1982 | 48.742 | 1981 | 48.85 | 1980 | 48.83 | 1979 | 47.86 | 1978 | 46.835 | 1977 | 45.64 | 1976 | 44.174 | 1975 | 42.399 | 1974 | 40.323 | 1973 | 39.798 | 1972 | 39.363 | 1971 | 39.916 | 1970 | 39.483 | 1969 | 40.089 | 1968 | 39.745 | 1967 | 39.589 | 1966 | 40.516 | 1965 | 42.177 | 1964 | 44.093 | 1963 | 44.783 | 1962 | 45.356 | 1961 | 45.912 | 1960 | 45.776 |
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