Year | Value | 2022 | 52.785855024256 | 2021 | 52.832846594659 | 2020 | 52.869327272196 | 2019 | 52.900197777762 | 2018 | 52.92375511753 | 2017 | 52.948393479239 | 2016 | 52.973111467584 | 2015 | 52.999889720456 | 2014 | 53.028709446538 | 2013 | 53.058318656549 | 2012 | 53.08218845048 | 2011 | 53.061477676777 | 2010 | 53.004099527943 | 2009 | 52.950446418361 | 2008 | 52.89393990461 | 2007 | 52.833565504803 | 2006 | 52.809036786048 | 2005 | 52.768567184957 | 2004 | 52.675912213926 | 2003 | 52.612375731089 | 2002 | 52.571574090978 | 2001 | 52.539531178716 | 2000 | 52.498868579081 | 1999 | 52.4529264571 | 1998 | 52.437479455964 | 1997 | 52.436030025696 | 1996 | 52.437854099745 | 1995 | 52.438907586392 | 1994 | 52.387675605147 | 1993 | 52.260999110878 | 1992 | 52.055391433972 | 1991 | 51.920110350782 | 1990 | 51.887537271751 | 1989 | 51.832476738071 | 1988 | 51.660035873065 | 1987 | 51.340017901398 | 1986 | 51.138634075487 | 1985 | 51.083451325957 | 1984 | 51.040040521198 | 1983 | 50.940373208381 | 1982 | 50.939170448451 | 1981 | 51.067577731696 | 1980 | 52.15700136427 | 1979 | 53.129923782643 | 1978 | 52.463931911401 | 1977 | 51.729416380858 | 1976 | 51.406537161278 | 1975 | 51.263268025054 | 1974 | 51.167521804751 | 1973 | 51.096431957361 | 1972 | 51.004384365214 | 1971 | 50.89294653806 | 1970 | 50.762322219954 | 1969 | 50.685495294264 | 1968 | 50.670920423785 | 1967 | 50.65303058656 | 1966 | 50.633329330598 | 1965 | 50.612605963956 | 1964 | 50.592112162126 | 1963 | 50.571873973026 | 1962 | 50.550845009282 | 1961 | 50.528304981824 | 1960 | 50.50387383056 |
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