Year | Value | 2021 | 14.204 | 2020 | 14.435 | 2019 | 14.682 | 2018 | 14.841 | 2017 | 15.081 | 2016 | 15.353 | 2015 | 15.585 | 2014 | 15.834 | 2013 | 16.088 | 2012 | 16.344 | 2011 | 16.609 | 2010 | 16.909 | 2009 | 17.275 | 2008 | 17.702 | 2007 | 18.173 | 2006 | 18.688 | 2005 | 19.265 | 2004 | 19.853 | 2003 | 20.444 | 2002 | 21.021 | 2001 | 21.576 | 2000 | 22.114 | 1999 | 22.649 | 1998 | 23.165 | 1997 | 23.731 | 1996 | 24.351 | 1995 | 24.939 | 1994 | 25.53 | 1993 | 26.091 | 1992 | 26.559 | 1991 | 27.011 | 1990 | 27.374 | 1989 | 27.7 | 1988 | 28.013 | 1987 | 28.366 | 1986 | 28.742 | 1985 | 29.142 | 1984 | 29.577 | 1983 | 30.008 | 1982 | 30.548 | 1981 | 30.936 | 1980 | 31.286 | 1979 | 31.663 | 1978 | 31.817 | 1977 | 32.023 | 1976 | 32.227 | 1975 | 32.462 | 1974 | 32.818 | 1973 | 33.386 | 1972 | 34.092 | 1971 | 35.044 | 1970 | 36.121 | 1969 | 37.327 | 1968 | 38.648 | 1967 | 39.978 | 1966 | 41.205 | 1965 | 42.401 | 1964 | 43.495 | 1963 | 44.28 | 1962 | 44.983 | 1961 | 45.547 | 1960 | 45.957 |
|