Year | Value | 2022 | 52.389401025849 | 2021 | 52.531989158277 | 2020 | 52.494402477659 | 2019 | 52.466271811046 | 2018 | 52.448360624692 | 2017 | 52.439423160969 | 2016 | 52.440201505493 | 2015 | 52.444690711017 | 2014 | 52.455355003211 | 2013 | 52.465864488238 | 2012 | 52.472477261717 | 2011 | 52.482333025324 | 2010 | 52.498731711773 | 2009 | 52.520874827843 | 2008 | 52.548196395887 | 2007 | 52.577986779449 | 2006 | 52.604756885299 | 2005 | 52.629991337993 | 2004 | 52.633398361006 | 2003 | 52.626367189694 | 2002 | 52.631061215023 | 2001 | 52.636602157695 | 2000 | 52.645456164107 | 1999 | 52.664977980631 | 1998 | 52.698221720561 | 1997 | 52.742860433216 | 1996 | 52.795644435516 | 1995 | 52.843755456734 | 1994 | 52.893726657872 | 1993 | 52.94939191386 | 1992 | 52.991655880373 | 1991 | 53.038003067073 | 1990 | 53.091525621965 | 1989 | 53.133964945375 | 1988 | 53.171116006945 | 1987 | 53.212351511901 | 1986 | 53.25641916495 | 1985 | 53.295339474201 | 1984 | 53.330084470435 | 1983 | 53.358898981396 | 1982 | 53.38800154043 | 1981 | 53.418713400002 | 1980 | 53.449688538813 | 1979 | 53.485718696852 | 1978 | 53.524814021028 | 1977 | 53.566691352424 | 1976 | 53.610735736495 | 1975 | 53.654602198597 | 1974 | 53.7009581691 | 1973 | 53.749026107497 | 1972 | 53.790112149947 | 1971 | 53.824489775246 | 1970 | 53.854233470039 | 1969 | 53.880518350809 | 1968 | 53.904522079459 | 1967 | 53.928412276891 | 1966 | 53.952411953785 | 1965 | 53.973629744167 | 1964 | 53.991844916581 | 1963 | 54.00978273234 | 1962 | 54.023973930198 | 1961 | 54.033831583841 | 1960 | 54.039537645531 |
|