Year | Value | 2021 | 36.608 | 2020 | 37.114 | 2019 | 37.675 | 2018 | 38.186 | 2017 | 38.678 | 2016 | 38.934 | 2015 | 39.022 | 2014 | 39.192 | 2013 | 39.129 | 2012 | 39.122 | 2011 | 39.202 | 2010 | 39.332 | 2009 | 39.642 | 2008 | 39.897 | 2007 | 40.423 | 2006 | 40.885 | 2005 | 40.926 | 2004 | 41.23 | 2003 | 41.405 | 2002 | 41.251 | 2001 | 41.375 | 2000 | 41.672 | 1999 | 42.226 | 1998 | 42.599 | 1997 | 43.041 | 1996 | 43.453 | 1995 | 44.006 | 1994 | 45.277 | 1993 | 44.57 | 1992 | 44.722 | 1991 | 45.135 | 1990 | 45.365 | 1989 | 45.506 | 1988 | 46.034 | 1987 | 46.278 | 1986 | 46.44 | 1985 | 46.589 | 1984 | 46.77 | 1983 | 46.842 | 1982 | 47.158 | 1981 | 47.275 | 1980 | 47.005 | 1979 | 46.522 | 1978 | 46.101 | 1977 | 46.304 | 1976 | 46.346 | 1975 | 46.391 | 1974 | 46.439 | 1973 | 46.538 | 1972 | 46.717 | 1971 | 46.736 | 1970 | 46.689 | 1969 | 46.729 | 1968 | 46.803 | 1967 | 46.827 | 1966 | 46.99 | 1965 | 47.003 | 1964 | 46.889 | 1963 | 46.656 | 1962 | 46.349 | 1961 | 45.985 | 1960 | 45.095 |
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