Year | Value | 2021 | 24.375035428831 | 2020 | 24.375035428831 | 2019 | 24.375035428831 | 2018 | 24.375035428831 | 2017 | 24.375035428831 | 2016 | 24.375035428831 | 2015 | 24.375035428831 | 2014 | 24.375035428831 | 2013 | 24.375035428831 | 2012 | 24.375035428831 | 2011 | 24.375035428831 | 2010 | 24.375035428831 | 2009 | 24.375035428831 | 2008 | 24.488407686639 | 2007 | 24.441925060938 | 2006 | 24.437390170625 | 2005 | 24.482739073749 | 2004 | 24.477070460858 | 2003 | 24.420384331954 | 2002 | 24.531489144606 | 2001 | 24.531489144606 | 2000 | 24.528087976872 | 1999 | 24.525820531716 | 1998 | 24.52922169945 | 1997 | 24.52922169945 | 1996 | 24.517884473669 | 1995 | 24.506547247888 | 1994 | 24.495210022108 | 1993 | 24.491808854373 | 1992 | 24.496343744686 | 1991 | 24.779774389207 | 1990 | 24.783175556941 | 1989 | 24.726489428037 | 1988 | 24.953233943654 | 1987 | 24.89654781475 | 1986 | 24.77183833116 | 1985 | 24.533756589763 | 1984 | 24.250325945241 | 1983 | 24.125616461652 | 1982 | 23.989569752282 | 1981 | 23.853523042911 | 1980 | 23.83084859135 | 1979 | 23.69480188198 | 1978 | 23.513406269486 | 1977 | 23.449917805113 | 1976 | 23.207301173403 | 1975 | 23.012300889972 | 1974 | 22.951079870756 | 1973 | 22.87738790318 | 1972 | 22.748143529278 | 1971 | 22.703928348733 | 1970 | 22.598492148971 | 1969 | 22.493055949209 | 1968 | 22.400090697806 | 1967 | 22.295788220622 | 1966 | 22.202822969219 | 1965 | 22.123462388753 | 1964 | 22.044101808288 | 1963 | 21.962473782665 | 1962 | 21.883113202199 | 1961 | 21.803752621734 |
|