Year | Value | 2022 | 78.842336401146 | 2021 | 75.97630963849 | 2020 | 78.700407972407 | 2019 | 78.43446283455 | 2018 | 79.068982616601 | 2017 | 79.082643899019 | 2016 | 79.150793012424 | 2015 | 79.878950436613 | 2014 | 80.145263110807 | 2013 | 80.708699475238 | 2012 | 81.106722302162 | 2011 | 80.932500737829 | 2010 | 81.278287303865 | 2009 | 81.111688978307 | 2008 | 78.98881198833 | 2007 | 78.093331610975 | 2006 | 78.863586655081 | 2005 | 78.929454867597 | 2004 | 78.148230519604 | 2003 | 78.365084163313 | 2002 | 77.671756135064 | 2001 | 77.893423450669 | 2000 | 78.285549831983 | 1999 | 77.986196649873 | 1998 | 77.232347440559 | 1997 | 76.787238021845 | 1996 | 76.11424411403 | 1995 | 76.297231288816 | 1994 | 77.725389743468 | 1993 | 77.921178787226 | 1992 | 78.551185465235 | 1991 | 77.764665606836 | 1990 | 77.399678992784 | 1989 | 77.855274760367 | 1988 | 77.538720075871 | 1987 | 77.612934487897 | 1986 | 77.117479085136 | 1985 | 77.419043319841 | 1984 | 77.293146311539 | 1983 | 77.416743951365 | 1982 | 77.748276199202 | 1981 | 77.500236449678 | 1980 | 76.103734228484 | 1979 | 74.63088968617 | 1978 | 74.091157449903 | 1977 | 74.727083933913 | 1976 | 74.710403472216 | 1975 | 76.317807876762 | 1974 | 74.302647897524 | 1973 | 75.739176071577 | 1972 | 76.390232436567 | 1971 | 75.534433248335 | 1970 | 73.919230374991 |
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