Year | Value | 2021 | 76.393898467449 | 2020 | 76.761923159442 | 2019 | 76.797760862155 | 2018 | 76.594163814036 | 2017 | 76.212392016465 | 2016 | 76.137923748796 | 2015 | 75.948816725426 | 2014 | 75.731305113524 | 2013 | 75.479116258053 | 2012 | 75.229813606518 | 2011 | 74.971354136662 | 2010 | 74.734365791944 | 2009 | 74.532509044743 | 2008 | 74.004824145488 | 2007 | 74.034883967227 | 2006 | 73.791887342035 | 2005 | 73.439399689652 | 2004 | 72.963256143255 | 2003 | 72.864514202292 | 2002 | 72.45015963397 | 2001 | 72.112950933525 | 2000 | 71.552569827067 | 1999 | 71.165819413601 | 1998 | 70.970425382534 | 1997 | 70.583740024882 | 1996 | 70.208331617976 | 1995 | 69.922664465451 | 1994 | 69.669144559868 | 1993 | 69.401141386968 | 1992 | 68.958784986909 | 1991 | 68.492286487489 | 1990 | 68.270209759883 | 1989 | 68.063180000513 | 1988 | 67.742335313822 | 1987 | 67.496963391279 | 1986 | 67.151920898738 | 1985 | 66.803921487322 | 1984 | 66.437547323211 | 1983 | 66.045374578466 | 1982 | 65.667007759281 | 1981 | 65.199343856042 | 1980 | 64.716965957083 | 1979 | 64.230319590444 | 1978 | 63.644422237992 | 1977 | 63.057112368986 | 1976 | 62.349080460827 | 1975 | 61.580695858778 | 1974 | 60.85864544636 | 1973 | 60.257549487318 | 1972 | 59.411099684308 | 1971 | 58.860658956772 | 1970 | 58.036411519034 | 1969 | 57.423578486481 | 1968 | 56.785023319868 | 1967 | 56.370081053993 | 1966 | 55.544012765441 | 1965 | 54.469055195129 | 1964 | 54.50712280855 | 1963 | 53.816421146949 | 1962 | 53.286610575964 | 1961 | 46.577019970354 | 1960 | 41.638256581189 |
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