Year | Value | 2024 | 53.386415678464 | 2023 | 53.396960518893 | 2022 | 53.408415340636 | 2021 | 53.428485679239 | 2020 | 53.435024405383 | 2019 | 53.42652071273 | 2018 | 53.420849587707 | 2017 | 53.414666877941 | 2016 | 53.407767868468 | 2015 | 53.402071752824 | 2014 | 53.398361577214 | 2013 | 53.442536015489 | 2012 | 53.533958045514 | 2011 | 53.628212720321 | 2010 | 53.726958296168 | 2009 | 53.834991094531 | 2008 | 53.933844937893 | 2007 | 54.018800838494 | 2006 | 54.106061891247 | 2005 | 54.205315226951 | 2004 | 54.322888172871 | 2003 | 54.45474758927 | 2002 | 54.511602419276 | 2001 | 54.448128056678 | 2000 | 54.326444346794 | 1999 | 54.19212255725 | 1998 | 54.073079772951 | 1997 | 53.962946800424 | 1996 | 53.85051243825 | 1995 | 53.736055656984 | 1994 | 53.617918336546 | 1993 | 53.4830404072 | 1992 | 53.368118655423 | 1991 | 53.292317198465 | 1990 | 53.233855772218 | 1989 | 53.255367032139 | 1988 | 53.323791929769 | 1987 | 53.370370390717 | 1986 | 53.41847118349 | 1985 | 53.465847209989 | 1984 | 53.511613707401 | 1983 | 53.555823515301 | 1982 | 53.607059978366 | 1981 | 53.664465654274 | 1980 | 53.71997461643 | 1979 | 53.756576018787 | 1978 | 53.777477774546 | 1977 | 53.802405476862 | 1976 | 53.826346148594 | 1975 | 53.845707392182 |
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