Year | Value | 2022 | 50.159 | 2021 | 50.575 | 2020 | 50.98 | 2019 | 51.374 | 2018 | 51.755 | 2017 | 52.124 | 2016 | 52.482 | 2015 | 52.827 | 2014 | 53.16 | 2013 | 53.481 | 2012 | 53.801 | 2011 | 54.122 | 2010 | 54.442 | 2009 | 54.761 | 2008 | 55.08 | 2007 | 55.399 | 2006 | 55.718 | 2005 | 56.035 | 2004 | 56.352 | 2003 | 56.67 | 2002 | 56.986 | 2001 | 57.302 | 2000 | 57.616 | 1999 | 57.931 | 1998 | 58.245 | 1997 | 58.558 | 1996 | 58.87 | 1995 | 59.183 | 1994 | 59.494 | 1993 | 59.804 | 1992 | 60.113 | 1991 | 60.422 | 1990 | 60.751 | 1989 | 61.085 | 1988 | 61.417 | 1987 | 61.75 | 1986 | 62.081 | 1985 | 62.411 | 1984 | 62.739 | 1983 | 63.067 | 1982 | 63.393 | 1981 | 63.718 | 1980 | 64.457 | 1979 | 65.33 | 1978 | 66.192 | 1977 | 67.043 | 1976 | 67.882 | 1975 | 68.712 | 1974 | 69.529 | 1973 | 70.334 | 1972 | 71.125 | 1971 | 71.906 | 1970 | 72.799 | 1969 | 73.717 | 1968 | 74.613 | 1967 | 75.491 | 1966 | 76.348 | 1965 | 77.183 | 1964 | 77.996 | 1963 | 78.791 | 1962 | 79.563 | 1961 | 80.314 | 1960 | 80.96 |
|