Year | Value | 2022 | 51.960585252159 | 2021 | 51.963670350526 | 2020 | 51.96144813373 | 2019 | 51.966559200386 | 2018 | 51.981660050108 | 2017 | 52.000293792841 | 2016 | 52.019123678639 | 2015 | 52.038718854873 | 2014 | 52.060399733492 | 2013 | 52.085707074971 | 2012 | 52.112241879634 | 2011 | 52.137346826339 | 2010 | 52.161378352079 | 2009 | 52.180642713789 | 2008 | 52.191348559984 | 2007 | 52.195274189317 | 2006 | 52.18868836588 | 2005 | 52.171962841886 | 2004 | 52.150056586692 | 2003 | 52.129834542433 | 2002 | 52.112439949992 | 2001 | 52.095739369343 | 2000 | 52.084479680038 | 1999 | 52.076039424254 | 1998 | 52.064225347816 | 1997 | 52.052421248745 | 1996 | 52.037970356162 | 1995 | 52.019671010403 | 1994 | 52.000788113026 | 1993 | 51.988039579963 | 1992 | 51.98420911844 | 1991 | 51.992076788523 | 1990 | 52.011314020787 | 1989 | 52.04414751139 | 1988 | 52.081515090285 | 1987 | 52.119580013183 | 1986 | 52.159737379623 | 1985 | 52.198252234784 | 1984 | 52.235944353068 | 1983 | 52.27566593344 | 1982 | 52.317392353492 | 1981 | 52.357706841938 | 1980 | 52.396138624268 | 1979 | 52.42904193495 | 1978 | 52.458868387177 | 1977 | 52.493928292866 | 1976 | 52.526103024692 | 1975 | 52.566306113411 | 1974 | 52.624480204241 | 1973 | 52.686709913278 | 1972 | 52.750127730748 | 1971 | 52.812717545256 | 1970 | 52.829047724234 | 1969 | 52.833553851861 | 1968 | 52.873178071365 | 1967 | 52.91696550547 | 1966 | 52.966351772868 | 1965 | 53.024081252408 | 1964 | 53.087917790227 | 1963 | 53.161416579347 | 1962 | 53.24235174098 | 1961 | 53.326837685821 | 1960 | 53.416335314364 |
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