Year | Value | 2022 | 49.221373125483 | 2021 | 49.229630775212 | 2020 | 49.240174635434 | 2019 | 49.256454953889 | 2018 | 49.274559782514 | 2017 | 49.29519105763 | 2016 | 49.319027233743 | 2015 | 49.346196665452 | 2014 | 49.371036530192 | 2013 | 49.393064342448 | 2012 | 49.41689891916 | 2011 | 49.441858886854 | 2010 | 49.456945349954 | 2009 | 49.441118299835 | 2008 | 49.405278721334 | 2007 | 49.383313970262 | 2006 | 49.384958800917 | 2005 | 49.39776087177 | 2004 | 49.410596585284 | 2003 | 49.42262102754 | 2002 | 49.436091807289 | 2001 | 49.452197110379 | 2000 | 49.467329443874 | 1999 | 49.475457167579 | 1998 | 49.480449677776 | 1997 | 49.488350590646 | 1996 | 49.498299167627 | 1995 | 49.511187418979 | 1994 | 49.528016017317 | 1993 | 49.54626296702 | 1992 | 49.563363637174 | 1991 | 49.579320197505 | 1990 | 49.593789024618 | 1989 | 49.60555799048 | 1988 | 49.616090619494 | 1987 | 49.626590879502 | 1986 | 49.636742847128 | 1985 | 49.648588483026 | 1984 | 49.662261723867 | 1983 | 49.676253313286 | 1982 | 49.689725979878 | 1981 | 49.703003240986 | 1980 | 49.704654397214 | 1979 | 49.665448903929 | 1978 | 49.598004948231 | 1977 | 49.531302754674 | 1976 | 49.446975309821 | 1975 | 49.383840090514 | 1974 | 49.433098571471 | 1973 | 49.561330066049 | 1972 | 49.700182523408 | 1971 | 49.853221142006 | 1970 | 49.977045904931 | 1969 | 49.997190023239 | 1968 | 49.952270325258 | 1967 | 49.909551291731 | 1966 | 49.865005670269 | 1965 | 49.81803682049 | 1964 | 49.768029962569 | 1963 | 49.713144797669 | 1962 | 49.655434398865 | 1961 | 49.596711735788 | 1960 | 49.544648129308 |
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