Year | Value | 2022 | 53.031521187758 | 2021 | 53.071339037432 | 2020 | 53.15340710649 | 2019 | 53.252151657217 | 2018 | 53.366261863172 | 2017 | 53.486925235415 | 2016 | 53.599702488996 | 2015 | 53.702739589677 | 2014 | 53.798406438621 | 2013 | 53.87995927599 | 2012 | 53.949299147565 | 2011 | 54.004873865975 | 2010 | 54.04258464189 | 2009 | 54.059404259547 | 2008 | 54.052223405568 | 2007 | 54.00795375163 | 2006 | 53.943505313982 | 2005 | 53.878708167372 | 2004 | 53.813967254633 | 2003 | 53.749818066534 | 2002 | 53.680287183653 | 2001 | 53.604996654628 | 2000 | 53.532175605485 | 1999 | 53.467885030699 | 1998 | 53.411994510996 | 1997 | 53.361258341236 | 1996 | 53.303500086781 | 1995 | 53.237999854294 | 1994 | 53.164418309085 | 1993 | 53.090382333191 | 1992 | 53.031765594184 | 1991 | 52.990186968241 | 1990 | 52.966139413452 | 1989 | 52.955623638416 | 1988 | 52.956418263041 | 1987 | 52.967935466324 | 1986 | 52.986528134712 | 1985 | 52.996690310418 | 1984 | 52.992244164599 | 1983 | 52.985600558041 | 1982 | 52.973909643727 | 1981 | 52.956269456553 | 1980 | 52.938197878795 | 1979 | 52.918458672545 | 1978 | 52.899563084087 | 1977 | 52.887118944992 | 1976 | 52.877372631708 | 1975 | 52.87031657338 | 1974 | 52.871126408419 | 1973 | 52.879236183032 | 1972 | 52.892567028478 | 1971 | 52.913685865569 | 1970 | 52.947512995511 | 1969 | 52.997826193674 | 1968 | 53.060754881533 | 1967 | 53.124263690462 | 1966 | 53.189438379741 | 1965 | 53.26194513621 | 1964 | 53.337557859622 | 1963 | 53.414430794266 | 1962 | 53.498589820492 | 1961 | 53.586502521242 | 1960 | 53.67157865746 |
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