Year | Value | 2021 | 43.253856751116 | 2020 | 43.16609028269 | 2019 | 43.125316574533 | 2018 | 40.791900276839 | 2017 | 40.100089950833 | 2016 | 39.506645881911 | 2015 | 39.722244054949 | 2014 | 39.996244771062 | 2013 | 40.402728229402 | 2012 | 40.008843760236 | 2011 | 39.84452451141 | 2010 | 39.897041161699 | 2009 | 40.349164755978 | 2008 | 40.733136547502 | 2007 | 40.023176997923 | 2006 | 41.080791516344 | 2005 | 41.804854050508 | 2004 | 42.290819672131 | 2003 | 41.67956284153 | 2002 | 42.379453551913 | 2001 | 42.11825136612 | 2000 | 43.23912568306 | 1999 | 42.218579234973 | 1998 | 40.68306010929 | 1997 | 39.147540983607 | 1996 | 40.765027322404 | 1995 | 42.885245901639 | 1994 | 43.191256830601 | 1993 | 43.267759562841 | 1992 | 42.382513661202 | 1991 | 42.841530054645 | 1990 | 43.311475409836 | 1989 | 43.770491803279 | 1988 | 43.770491803279 | 1987 | 43.726775956284 | 1986 | 43.68306010929 | 1985 | 43.650273224044 | 1984 | 43.617486338798 | 1983 | 43.584699453552 | 1982 | 43.551912568306 | 1981 | 43.51912568306 | 1980 | 43.486338797814 | 1979 | 43.453551912568 | 1978 | 43.398907103825 | 1977 | 43.344262295082 | 1976 | 43.289617486339 | 1975 | 43.234972677596 | 1974 | 43.180327868853 | 1973 | 43.125683060109 | 1972 | 43.071038251366 | 1971 | 43.005464480874 | 1970 | 42.939890710382 | 1969 | 42.874316939891 | 1968 | 42.765027322404 | 1967 | 42.743169398907 | 1966 | 42.677595628415 | 1965 | 42.612021857924 | 1964 | 42.546448087432 | 1963 | 42.48087431694 | 1962 | 42.415300546448 | 1961 | 42.349726775956 |
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