Year | Value | 2022 | 82.104846360026 | 2021 | 81.850857696086 | 2020 | 81.662610631196 | 2019 | 81.473827618622 | 2018 | 81.281446237816 | 2017 | 81.09877062417 | 2016 | 80.919425939494 | 2015 | 80.743925998894 | 2014 | 80.571081225538 | 2013 | 80.40334950941 | 2012 | 80.235878304919 | 2011 | 80.062073168373 | 2010 | 79.85237473343 | 2009 | 79.573971479373 | 2008 | 79.283961811677 | 2007 | 78.980919586728 | 2006 | 78.667056040917 | 2005 | 78.335671185137 | 2004 | 77.973095119157 | 2003 | 77.59630096711 | 2002 | 77.206866095952 | 2001 | 76.80024114399 | 2000 | 76.454477699137 | 1999 | 76.238242733182 | 1998 | 76.014082511748 | 1997 | 75.790004152573 | 1996 | 75.567884595715 | 1995 | 75.332844181665 | 1994 | 75.079654972917 | 1993 | 74.82150236436 | 1992 | 74.56576998547 | 1991 | 74.31297021092 | 1990 | 74.059232640994 | 1989 | 73.838913769696 | 1988 | 73.624937942181 | 1987 | 73.373479291762 | 1986 | 73.109690748741 | 1985 | 72.881164183335 | 1984 | 72.681637915693 | 1983 | 72.475424139143 | 1982 | 72.256054826493 | 1981 | 72.01885557144 | 1980 | 71.737070271231 | 1979 | 71.469765192216 | 1978 | 71.20250192328 | 1977 | 70.936144170923 | 1976 | 70.671033347579 | 1975 | 70.396450044497 | 1974 | 70.051844472743 | 1973 | 69.683133068699 | 1972 | 69.311605879527 | 1971 | 68.930978365586 | 1970 | 68.516317245942 | 1969 | 68.035099076275 | 1968 | 67.533887144506 | 1967 | 67.007154144685 | 1966 | 66.47134336257 | 1965 | 65.940321889178 | 1964 | 65.394862485444 | 1963 | 64.850991040333 | 1962 | 64.3052373838 | 1961 | 63.777695574901 | 1960 | 63.261986181079 |
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