Year | Value | 2021 | 29.736598890943 | 2020 | 29.870609981516 | 2019 | 29.500924214418 | 2018 | 29.634935304991 | 2017 | 29.759704251386 | 2016 | 25.50831792976 | 2015 | 24.671903881701 | 2014 | 24.847504621072 | 2013 | 24.043438077634 | 2012 | 24.316081330869 | 2011 | 23.890942698706 | 2010 | 23.313308687615 | 2009 | 24.149722735675 | 2008 | 23.826247689464 | 2007 | 23.941774491682 | 2006 | 23.512014787431 | 2005 | 23.775415896488 | 2004 | 23.729205175601 | 2003 | 25.462107208872 | 2002 | 26.016635859519 | 2001 | 25.924214417745 | 2000 | 26.155268022181 | 1999 | 25.83179297597 | 1998 | 25.970425138632 | 1997 | 26.016635859519 | 1996 | 26.062846580407 | 1995 | 26.478743068392 | 1994 | 26.756007393715 | 1993 | 26.663585951941 | 1992 | 26.663585951941 | 1991 | 26.709796672828 | 1990 | 26.756007393715 | 1989 | 26.571164510166 | 1988 | 26.617375231054 | 1987 | 26.663585951941 | 1986 | 26.756007393715 | 1985 | 26.571164510166 | 1984 | 26.062846580407 | 1983 | 25.554528650647 | 1982 | 24.953789279113 | 1981 | 24.861367837338 | 1980 | 24.630314232902 | 1979 | 24.630314232902 | 1978 | 24.630314232902 | 1977 | 24.537892791128 | 1976 | 24.49168207024 | 1975 | 24.953789279113 | 1974 | 25.184842883549 | 1973 | 24.815157116451 | 1972 | 24.353049907579 | 1971 | 24.353049907579 | 1970 | 24.260628465804 | 1969 | 24.16820702403 | 1968 | 24.075785582255 | 1967 | 24.260628465804 | 1966 | 24.260628465804 | 1965 | 23.752310536044 | 1964 | 24.260628465804 | 1963 | 24.121996303142 | 1962 | 23.336414048059 | 1961 | 23.613678373383 |
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