Year | Value | 2022 | 80.917308036653 | 2021 | 78.728574181056 | 2020 | 82.577714191895 | 2019 | 82.570827890938 | 2018 | 85.275279447009 | 2017 | 84.436467243556 | 2016 | 83.376469651473 | 2015 | 84.004217103913 | 2014 | 82.332955462195 | 2013 | 82.793803323967 | 2012 | 81.548836917774 | 2011 | 79.909277796573 | 2010 | 79.397832652641 | 2009 | 78.882044434113 | 2008 | 76.708096736079 | 2007 | 75.520556803798 | 2006 | 75.699603427859 | 2005 | 75.171253382424 | 2004 | 75.446136917302 | 2003 | 74.635863206437 | 2002 | 74.133671156184 | 2001 | 83.068258622406 | 2000 | 83.116203111324 | 1999 | 83.865476522187 | 1998 | 81.54813118993 | 1997 | 81.388385229752 | 1996 | 81.025405314537 | 1995 | 81.910244378841 | 1994 | 83.108809353636 | 1993 | 82.716341043641 | 1992 | 84.832196249988 | 1991 | 83.765984981426 | 1990 | 80.274802010619 | 1989 | 78.006437957735 | 1988 | 78.040193765644 | 1987 | 80.147692254943 | 1986 | 80.700313498463 | 1985 | 76.948162111216 | 1984 | 77.202498356345 | 1983 | 75.796876427071 | 1982 | 75.675551996339 | 1981 | 77.759792246296 | 1980 | 76.163943193734 | 1979 | 73.962033703642 | 1978 | 69.306852617879 | 1977 | 66.768812939039 | 1976 | 66.016767683993 | 1975 | 70.7137838666 | 1974 | 77.126106935412 | 1973 | 77.203018388408 | 1972 | 75.748565291364 | 1971 | 76.487692080795 | 1970 | 74.694222005323 | 1969 | 76.009402979016 | 1968 | 77.228763077663 | 1967 | 76.286432620305 | 1966 | 77.794225567727 | 1965 | 75.497031625649 | 1964 | 75.900750805426 | 1963 | 82.013373876965 | 1962 | 79.246139524279 | 1961 | 70.100692830089 | 1960 | 79.036479188819 |
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