Year | Value | 2022 | 77.307024704076 | 2021 | 77.448559670782 | 2020 | 78.091437967489 | 2019 | 76.230677640458 | 2018 | 76.81705249535 | 2017 | 76.995196526084 | 2016 | 77.271405753666 | 2015 | 77.974050452095 | 2014 | 79.008103752828 | 2013 | 78.862264947677 | 2012 | 79.499255167277 | 2011 | 79.151371123079 | 2010 | 78.721815515671 | 2009 | 77.568143582435 | 2008 | 76.280912557535 | 2007 | 75.335901348068 | 2006 | 75.1291811405 | 2005 | 75.41658713958 | 2004 | 75.414835526048 | 2003 | 74.702405436601 | 2002 | 75.306983371401 | 2001 | 75.814879749156 | 2000 | 76.315232977953 | 1999 | 76.395740973573 | 1998 | 76.530459915862 | 1997 | 77.215618909696 | 1996 | 77.953937322543 | 1995 | 78.602351776425 | 1994 | 79.436365466098 | 1993 | 80.247316167742 | 1992 | 79.783575961694 | 1991 | 78.204137486567 | 1990 | 77.59026809327 | 1989 | 77.731526658626 | 1988 | 76.95307410081 | 1987 | 77.884402530835 | 1986 | 77.374976226966 | 1985 | 78.355484726709 | 1984 | 78.357910853163 | 1983 | 80.009517106015 | 1982 | 80.202803415019 | 1981 | 80.348329857607 | 1980 | 78.933007497645 | 1979 | 77.057309026388 | 1978 | 75.965644769788 | 1977 | 76.661902603563 | 1976 | 77.097295441831 | 1975 | 74.838629174985 | 1974 | 74.139005550143 | 1973 | 73.082316995455 | 1972 | 73.388905203256 | 1971 | 73.92087839007 | 1970 | 73.55326844818 |
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