Year | Value | 2021 | 21.048178315882 | 2020 | 21.270133339028 | 2019 | 21.659293215865 | 2018 | 22.139134491144 | 2017 | 22.433282887104 | 2016 | 22.913307370568 | 2015 | 23.265107865397 | 2014 | 23.573335026244 | 2013 | 24.121180657336 | 2012 | 24.410597884004 | 2011 | 24.706125558042 | 2010 | 25.052983891834 | 2009 | 25.380360145572 | 2008 | 25.613345798635 | 2007 | 25.856323420916 | 2006 | 26.088697961283 | 2005 | 26.507270619735 | 2004 | 27.015889781824 | 2003 | 27.434616150869 | 2002 | 27.907940746705 | 2001 | 28.297946451638 | 2000 | 28.505333690162 | 1999 | 28.741754098839 | 1998 | 29.132979236938 | 1997 | 29.581497586476 | 1996 | 30.089507328596 | 1995 | 30.724508849655 | 1994 | 31.326097835383 | 1993 | 31.9163033501 | 1992 | 32.625218522092 | 1991 | 33.220747926988 | 1990 | 33.719267545388 | 1989 | 34.392173551859 | 1988 | 35.019649716688 | 1987 | 35.62807796699 | 1986 | 36.340345154069 | 1985 | 36.703035378792 | 1984 | 37.222785682682 | 1983 | 37.565657682154 | 1982 | 37.833247899591 | 1981 | 38.078907852227 | 1980 | 38.210875035236 | 1979 | 38.271621177156 | 1978 | 38.303956599544 | 1977 | 38.515599495422 | 1976 | 38.928497253768 | 1975 | 39.095841476835 | 1974 | 39.510885414761 | 1973 | 39.785448205726 | 1972 | 40.018046391705 | 1971 | 40.230574381755 | 1970 | 40.300566515891 | 1969 | 40.490455116674 | 1968 | 40.79914784306 | 1967 | 41.113181266117 | 1966 | 41.431007251471 | 1965 | 41.853036351941 | 1964 | 42.254881797614 | 1963 | 42.589419593548 | 1962 | 42.8783308502 | 1961 | 42.923175646495 | 1960 | 43.338119488986 |
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