Year | Value | 2022 | 74.481007816829 | 2021 | 75.66014851082 | 2020 | 79.524896353386 | 2019 | 78.418050426982 | 2018 | 78.568367810663 | 2017 | 78.679563738151 | 2016 | 79.532350250527 | 2015 | 78.686794189431 | 2014 | 76.062874424093 | 2013 | 76.665199981706 | 2012 | 77.078160359675 | 2011 | 77.048616650029 | 2010 | 78.473823651928 | 2009 | 79.537513984933 | 2008 | 74.180768116642 | 2007 | 73.978677281544 | 2006 | 73.667790566988 | 2005 | 73.381950838965 | 2004 | 74.135824466731 | 2003 | 75.571790854215 | 2002 | 75.790303488268 | 2001 | 74.603485258205 | 2000 | 73.641013215341 | 1999 | 75.568623210046 | 1998 | 76.919936334379 | 1997 | 76.729830906555 | 1996 | 77.184782178886 | 1995 | 77.485056293672 | 1994 | 79.264670973216 | 1993 | 81.536255901649 | 1992 | 82.147052764617 | 1991 | 81.297371087232 | 1990 | 78.459844054861 | 1989 | 76.22692192579 | 1988 | 75.589812631801 | 1987 | 76.500515377758 | 1986 | 77.567931944629 | 1985 | 76.174686566925 | 1984 | 75.775239942336 | 1983 | 76.887894122227 | 1982 | 76.580512698973 | 1981 | 74.138202509515 | 1980 | 75.122772363168 | 1979 | 75.165720192092 | 1978 | 77.102773663764 | 1977 | 77.205916136874 | 1976 | 76.249031106894 | 1975 | 77.112598332259 | 1974 | 74.177153015038 | 1973 | 75.149388150574 | 1972 | 77.263755656892 | 1971 | 77.191285116736 | 1970 | 77.201721632141 | 1969 | 77.20854074856 | 1968 | 77.161493171718 | 1967 | 76.451240055602 | 1966 | 74.898701767741 | 1965 | 75.555030220183 | 1964 | 76.678130216393 | 1963 | 77.992054093114 | 1962 | 78.524216283479 | 1961 | 79.872486880558 |
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