Year | Value | 2022 | 46.125 | 2021 | 46.548 | 2020 | 46.968 | 2019 | 47.386 | 2018 | 47.802 | 2017 | 48.216 | 2016 | 48.627 | 2015 | 49.036 | 2014 | 49.442 | 2013 | 49.846 | 2012 | 50.246 | 2011 | 50.644 | 2010 | 51.039 | 2009 | 51.431 | 2008 | 51.82 | 2007 | 52.206 | 2006 | 52.588 | 2005 | 52.968 | 2004 | 53.344 | 2003 | 53.717 | 2002 | 54.086 | 2001 | 54.452 | 2000 | 54.814 | 1999 | 55.177 | 1998 | 55.539 | 1997 | 55.9 | 1996 | 56.259 | 1995 | 56.62 | 1994 | 56.979 | 1993 | 57.337 | 1992 | 57.694 | 1991 | 58.051 | 1990 | 58.591 | 1989 | 59.157 | 1988 | 59.72 | 1987 | 60.283 | 1986 | 60.842 | 1985 | 61.398 | 1984 | 61.95 | 1983 | 62.5 | 1982 | 63.047 | 1981 | 63.591 | 1980 | 64.13 | 1979 | 64.667 | 1978 | 65.2 | 1977 | 65.729 | 1976 | 66.253 | 1975 | 66.775 | 1974 | 67.292 | 1973 | 67.805 | 1972 | 68.313 | 1971 | 68.818 | 1970 | 69.317 | 1969 | 69.813 | 1968 | 70.303 | 1967 | 70.79 | 1966 | 71.271 | 1965 | 71.748 | 1964 | 72.219 | 1963 | 72.686 | 1962 | 73.149 | 1961 | 73.606 | 1960 | 74.057 |
|