Year | Value | 2022 | 21.146 | 2021 | 21.446 | 2020 | 21.75 | 2019 | 22.058 | 2018 | 22.371 | 2017 | 22.688 | 2016 | 23.01 | 2015 | 23.337 | 2014 | 23.668 | 2013 | 24.003 | 2012 | 24.344 | 2011 | 24.69 | 2010 | 25.039 | 2009 | 25.392 | 2008 | 25.748 | 2007 | 26.108 | 2006 | 26.471 | 2005 | 26.837 | 2004 | 27.206 | 2003 | 27.579 | 2002 | 27.954 | 2001 | 28.348 | 2000 | 28.836 | 1999 | 29.331 | 1998 | 29.83 | 1997 | 30.334 | 1996 | 30.842 | 1995 | 31.356 | 1994 | 31.874 | 1993 | 32.396 | 1992 | 32.922 | 1991 | 33.415 | 1990 | 33.562 | 1989 | 33.71 | 1988 | 33.857 | 1987 | 34.006 | 1986 | 34.154 | 1985 | 34.303 | 1984 | 34.452 | 1983 | 34.601 | 1982 | 34.751 | 1981 | 34.901 | 1980 | 35.051 | 1979 | 35.202 | 1978 | 35.353 | 1977 | 35.504 | 1976 | 35.655 | 1975 | 35.807 | 1974 | 35.959 | 1973 | 36.111 | 1972 | 36.264 | 1971 | 36.588 | 1970 | 38.325 | 1969 | 40.092 | 1968 | 41.882 | 1967 | 43.7 | 1966 | 45.531 | 1965 | 47.375 | 1964 | 49.224 | 1963 | 51.08 | 1962 | 52.93 | 1961 | 54.772 | 1960 | 56.599 |
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