Year | Value | 2022 | 52.774600157143 | 2021 | 52.823062700601 | 2020 | 52.890168158998 | 2019 | 52.921094298826 | 2018 | 52.880151735148 | 2017 | 52.826716040736 | 2016 | 52.758149638973 | 2015 | 52.672919204765 | 2014 | 52.571875943399 | 2013 | 52.453211205355 | 2012 | 52.319132465844 | 2011 | 52.17021321209 | 2010 | 52.052855853321 | 2009 | 51.970516036432 | 2008 | 51.874878765311 | 2007 | 51.762832335948 | 2006 | 51.630738509727 | 2005 | 51.478271730005 | 2004 | 51.306278778491 | 2003 | 51.117856450896 | 2002 | 50.916372171353 | 2001 | 50.702517830578 | 2000 | 50.475855393685 | 1999 | 50.275331321209 | 1998 | 50.108140897585 | 1997 | 49.939395941014 | 1996 | 49.773333127351 | 1995 | 49.61247637051 | 1994 | 49.455732677521 | 1993 | 49.365480282026 | 1992 | 49.342953001392 | 1991 | 49.319661714361 | 1990 | 49.294488872278 | 1989 | 49.268765889122 | 1988 | 49.242447061659 | 1987 | 49.212694294897 | 1986 | 49.177398080931 | 1985 | 49.136183561984 | 1984 | 49.084763753684 | 1983 | 49.024481505238 | 1982 | 48.979385002265 | 1981 | 48.953359151372 | 1980 | 48.927644782998 | 1979 | 48.942228712239 | 1978 | 48.976246557338 | 1977 | 48.98904476061 | 1976 | 49.056884057971 | 1975 | 49.14460817194 | 1974 | 49.18363975523 | 1973 | 49.194765978863 | 1972 | 49.193743818812 | 1971 | 49.219431194543 | 1970 | 49.299427363506 | 1969 | 49.409119135884 | 1968 | 49.452469674146 | 1967 | 49.415968920856 | 1966 | 49.366039062474 | 1965 | 49.317989220704 | 1964 | 49.274022682896 | 1963 | 49.235030987428 | 1962 | 49.199610796785 | 1961 | 49.170657890871 | 1960 | 49.151864028936 |
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