Year | Value | 2022 | 39.703 | 2021 | 40.128 | 2020 | 40.547 | 2019 | 40.961 | 2018 | 41.368 | 2017 | 41.769 | 2016 | 42.163 | 2015 | 42.552 | 2014 | 42.933 | 2013 | 43.315 | 2012 | 43.697 | 2011 | 44.081 | 2010 | 44.465 | 2009 | 44.85 | 2008 | 45.235 | 2007 | 45.621 | 2006 | 46.008 | 2005 | 46.395 | 2004 | 46.782 | 2003 | 47.17 | 2002 | 47.559 | 2001 | 47.602 | 2000 | 47.362 | 1999 | 47.121 | 1998 | 46.88 | 1997 | 46.64 | 1996 | 46.4 | 1995 | 46.159 | 1994 | 45.92 | 1993 | 45.68 | 1992 | 45.441 | 1991 | 45.201 | 1990 | 44.962 | 1989 | 44.723 | 1988 | 44.792 | 1987 | 45.13 | 1986 | 45.468 | 1985 | 45.806 | 1984 | 46.145 | 1983 | 46.484 | 1982 | 46.824 | 1981 | 47.164 | 1980 | 47.503 | 1979 | 47.844 | 1978 | 48.253 | 1977 | 48.721 | 1976 | 49.188 | 1975 | 49.656 | 1974 | 50.124 | 1973 | 50.591 | 1972 | 51.058 | 1971 | 51.526 | 1970 | 51.994 | 1969 | 52.478 | 1968 | 52.975 | 1967 | 53.473 | 1966 | 53.97 | 1965 | 54.466 | 1964 | 54.961 | 1963 | 55.456 | 1962 | 55.949 | 1961 | 56.441 | 1960 | 56.931 |
|