Year | Value | 2022 | 48.59946647602 | 2021 | 48.604714951217 | 2020 | 48.610101144271 | 2019 | 48.619012369157 | 2018 | 48.631729317036 | 2017 | 48.644623010358 | 2016 | 48.656155864295 | 2015 | 48.665584243693 | 2014 | 48.674782892737 | 2013 | 48.684612191751 | 2012 | 48.695039598701 | 2011 | 48.706963543481 | 2010 | 48.721608063596 | 2009 | 48.739760163991 | 2008 | 48.760773865957 | 2007 | 48.783247803513 | 2006 | 48.807445146727 | 2005 | 48.835144403599 | 2004 | 48.864964063024 | 2003 | 48.894723918505 | 2002 | 48.923890677072 | 2001 | 48.951860199033 | 2000 | 48.979219173776 | 1999 | 49.006232172631 | 1998 | 49.033210699622 | 1997 | 49.058543624259 | 1996 | 49.081518180977 | 1995 | 49.104264571266 | 1994 | 49.125932792974 | 1993 | 49.145780876832 | 1992 | 49.164447695652 | 1991 | 49.182039301338 | 1990 | 49.198873010379 | 1989 | 49.214248472191 | 1988 | 49.227328078201 | 1987 | 49.239165794307 | 1986 | 49.251025211053 | 1985 | 49.262609275664 | 1984 | 49.274110382018 | 1983 | 49.285460230013 | 1982 | 49.295823607391 | 1981 | 49.305028951844 | 1980 | 49.312926228206 | 1979 | 49.317715045459 | 1978 | 49.318808621312 | 1977 | 49.31642415738 | 1976 | 49.310404021162 | 1975 | 49.300355372451 | 1974 | 49.285050103005 | 1973 | 49.266768885736 | 1972 | 49.249090772199 | 1971 | 49.232047520092 | 1970 | 49.214792904196 | 1969 | 49.198531360714 | 1968 | 49.18315173169 | 1967 | 49.169626872437 | 1966 | 49.160968994497 | 1965 | 49.153976466135 | 1964 | 49.145031927796 | 1963 | 49.135987240371 | 1962 | 49.128004611881 | 1961 | 49.120127974216 | 1960 | 49.11343997527 |
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