Year | Value | 2021 | 44.128277151476 | 2020 | 44.083918770792 | 2019 | 44.025690462997 | 2018 | 43.953882397743 | 2017 | 43.817304060925 | 2016 | 43.719566325104 | 2015 | 43.618802924127 | 2014 | 43.497801135035 | 2013 | 43.383412002422 | 2012 | 43.192034151168 | 2011 | 43.17622871764 | 2010 | 43.013188707153 | 2009 | 42.844049687531 | 2008 | 42.628959542913 | 2007 | 42.508529797661 | 2006 | 42.340778561975 | 2005 | 42.226358368823 | 2004 | 41.882649825957 | 2003 | 42.075811299394 | 2002 | 41.822751793371 | 2001 | 41.720057215465 | 2000 | 41.56579388045 | 1999 | 41.426745799314 | 1998 | 41.220967561574 | 1997 | 41.119923873048 | 1996 | 40.949389955902 | 1995 | 40.786488109546 | 1994 | 40.514821734543 | 1993 | 40.244798606247 | 1992 | 40.766057275336 | 1991 | 40.547359867142 | 1990 | 40.41842090009 | 1989 | 40.335262264998 | 1988 | 40.197609464991 | 1987 | 39.98793346818 | 1986 | 39.886059387339 | 1985 | 39.685317484899 | 1984 | 39.471110928383 | 1983 | 39.435247525859 | 1982 | 39.37762050008 | 1981 | 39.337141854492 | 1980 | 39.286797597584 | 1979 | 39.243905476265 | 1978 | 39.223285078356 | 1977 | 39.150796123077 | 1976 | 39.130980217078 | 1975 | 39.099223957464 | 1974 | 39.048176012736 | 1973 | 39.055051252655 | 1972 | 39.039046639939 | 1971 | 39.007249115735 | 1970 | 38.930909653495 | 1969 | 38.917403115251 | 1968 | 38.876671799292 | 1967 | 38.810875058128 | 1966 | 38.800967440732 | 1965 | 38.779246894904 | 1964 | 38.771625650754 | 1963 | 38.769000555546 | 1962 | 38.733096027549 | 1961 | 38.723781173588 |
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