Year | Value | 2022 | 49.295008834032 | 2021 | 49.272303332189 | 2020 | 49.248090792911 | 2019 | 49.228868512368 | 2018 | 49.213982463814 | 2017 | 49.200091927799 | 2016 | 49.189745077058 | 2015 | 49.183184148804 | 2014 | 49.178796237552 | 2013 | 49.176134391225 | 2012 | 49.175219232735 | 2011 | 49.175818054662 | 2010 | 49.176365634548 | 2009 | 49.177364618519 | 2008 | 49.180426416213 | 2007 | 49.185077874096 | 2006 | 49.190647943244 | 2005 | 49.197131555662 | 2004 | 49.203989885388 | 2003 | 49.210628217415 | 2002 | 49.21743977511 | 2001 | 49.225025343999 | 2000 | 49.235964581677 | 1999 | 49.24829896601 | 1998 | 49.257021467236 | 1997 | 49.265893480755 | 1996 | 49.276974239275 | 1995 | 49.288581207202 | 1994 | 49.30042134893 | 1993 | 49.312242319932 | 1992 | 49.325464843738 | 1991 | 49.341108220814 | 1990 | 49.356787936298 | 1989 | 49.371234920746 | 1988 | 49.383189530983 | 1987 | 49.393168843485 | 1986 | 49.401555740606 | 1985 | 49.406926599608 | 1984 | 49.409712044761 | 1983 | 49.410045653436 | 1982 | 49.40996552114 | 1981 | 49.409624293472 | 1980 | 49.406823851486 | 1979 | 49.398652206814 | 1978 | 49.388642866723 | 1977 | 49.381146540638 | 1976 | 49.373203272196 | 1975 | 49.36337598215 | 1974 | 49.357263196077 | 1973 | 49.358086564028 | 1972 | 49.360835267008 | 1971 | 49.364649086564 | 1970 | 49.367686428323 | 1969 | 49.366184995155 | 1968 | 49.361242659667 | 1967 | 49.353841568017 | 1966 | 49.34393356108 | 1965 | 49.327873489396 | 1964 | 49.309431581393 | 1963 | 49.295248817954 | 1962 | 49.279728516736 | 1961 | 49.254894664572 | 1960 | 49.220413575382 |
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