Year | Value | 2021 | 25.802696483654 | 2020 | 25.557688848226 | 2019 | 25.589179931126 | 2018 | 25.600298977578 | 2017 | 25.599106468127 | 2016 | 25.579046151441 | 2015 | 25.545319113321 | 2014 | 25.511211134682 | 2013 | 25.477152843936 | 2012 | 25.443092002546 | 2011 | 25.547107877497 | 2010 | 25.687095236896 | 2009 | 25.826845198581 | 2008 | 25.966595160267 | 2007 | 26.085468516343 | 2006 | 26.119516113693 | 2005 | 26.180903291805 | 2004 | 26.191180458665 | 2003 | 26.201463141986 | 2002 | 26.211762374691 | 2001 | 26.272286822432 | 2000 | 26.24105478265 | 1999 | 26.215767252074 | 1998 | 26.2531197923 | 1997 | 26.268182190353 | 1996 | 26.345314910053 | 1995 | 26.560602372333 | 1994 | 26.619522280321 | 1993 | 26.723083163638 | 1992 | 26.863720719084 | 1991 | 26.951294847601 | 1990 | 26.944108682319 | 1989 | 26.937156806295 | 1988 | 26.93020493027 | 1987 | 26.923253054246 | 1986 | 27.161872998715 | 1985 | 27.166237673386 | 1984 | 27.170541215687 | 1983 | 27.174844757988 | 1982 | 27.179148300288 | 1981 | 27.004910010723 | 1980 | 27.025324249843 | 1979 | 27.046014357058 | 1978 | 27.066704464274 | 1977 | 27.207010978005 | 1976 | 27.218100323737 | 1975 | 27.216556014134 | 1974 | 27.215066326415 | 1973 | 27.271067549945 | 1972 | 27.330268843391 | 1971 | 27.383952774913 | 1970 | 27.452257715534 | 1969 | 27.517472933478 | 1968 | 27.544121791571 | 1967 | 27.524651021341 | 1966 | 27.545506649414 | 1965 | 27.557258630313 | 1964 | 27.706337749503 | 1963 | 27.816348428909 | 1962 | 27.932819939128 | 1961 | 28.102815377373 |
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