Year | Value | 2022 | 49.085532275243 | 2021 | 49.075875353165 | 2020 | 49.063175161109 | 2019 | 49.053470280364 | 2018 | 49.048108776283 | 2017 | 49.044547882071 | 2016 | 49.041507358737 | 2015 | 49.037370665982 | 2014 | 49.030832374101 | 2013 | 49.024276600075 | 2012 | 49.018507852391 | 2011 | 49.013755946639 | 2010 | 49.011432955909 | 2009 | 49.008631284255 | 2008 | 49.005585602515 | 2007 | 49.003783476181 | 2006 | 49.002897555502 | 2005 | 49.00453898738 | 2004 | 49.006323741119 | 2003 | 49.00730702068 | 2002 | 49.005441823061 | 2001 | 48.998876157275 | 2000 | 48.989776348505 | 1999 | 48.97924717335 | 1998 | 48.964486423041 | 1997 | 49.023211435759 | 1996 | 49.157584670553 | 1995 | 49.21514914203 | 1994 | 49.200368858424 | 1993 | 49.190524775111 | 1992 | 49.182611696899 | 1991 | 49.175490612673 | 1990 | 49.171712567336 | 1989 | 49.170411450898 | 1988 | 49.170499316546 | 1987 | 49.167295603457 | 1986 | 49.155210085168 | 1985 | 49.138109073346 | 1984 | 49.120336849505 | 1983 | 49.099388355473 | 1982 | 49.074714441371 | 1981 | 49.049573112625 | 1980 | 49.02517041921 | 1979 | 49.001686080918 | 1978 | 48.979951674862 | 1977 | 48.95953074414 | 1976 | 48.937687766855 | 1975 | 48.906159815404 | 1974 | 48.881718023213 | 1973 | 48.876266538009 | 1972 | 48.873976194044 | 1971 | 48.872491534713 | 1970 | 48.872365479202 | 1969 | 48.872457048454 | 1968 | 48.872444986061 | 1967 | 48.871317345003 | 1966 | 48.868008431358 | 1965 | 48.956123675982 | 1964 | 49.144752005054 | 1963 | 49.317616990119 | 1962 | 49.444247282706 | 1961 | 49.549221768681 | 1960 | 49.568148374447 |
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