Year | Value | 2021 | 12.883 | 2020 | 13.078 | 2019 | 13.633 | 2018 | 14.133 | 2017 | 14.159 | 2016 | 14.051 | 2015 | 14.727 | 2014 | 14.753 | 2013 | 14.69 | 2012 | 14.939 | 2011 | 15.309 | 2010 | 15.492 | 2009 | 15.715 | 2008 | 15.943 | 2007 | 16.372 | 2006 | 16.852 | 2005 | 17.335 | 2004 | 17.632 | 2003 | 17.85 | 2002 | 18.574 | 2001 | 19.271 | 2000 | 19.841 | 1999 | 20.445 | 1998 | 21.06 | 1997 | 21.477 | 1996 | 21.846 | 1995 | 22.319 | 1994 | 22.586 | 1993 | 23.022 | 1992 | 23.376 | 1991 | 24.148 | 1990 | 24.844 | 1989 | 25.661 | 1988 | 26.42 | 1987 | 27.334 | 1986 | 28.09 | 1985 | 28.99 | 1984 | 29.804 | 1983 | 30.578 | 1982 | 31.213 | 1981 | 31.756 | 1980 | 32.152 | 1979 | 32.461 | 1978 | 32.741 | 1977 | 32.966 | 1976 | 33.173 | 1975 | 33.366 | 1974 | 33.619 | 1973 | 34.258 | 1972 | 34.641 | 1971 | 35.094 | 1970 | 35.624 | 1969 | 36.137 | 1968 | 36.827 | 1967 | 37.882 | 1966 | 39.02 | 1965 | 40.106 | 1964 | 41.238 | 1963 | 42.176 | 1962 | 42.844 | 1961 | 43.431 | 1960 | 43.86 |
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