Year | Value | 2022 | 81.636383660831 | 2021 | 81.431483712993 | 2020 | 81.24796386091 | 2019 | 81.061702857458 | 2018 | 80.869369007925 | 2017 | 80.685892429012 | 2016 | 80.504920027669 | 2015 | 80.326219697963 | 2014 | 80.151180666156 | 2013 | 79.983167794262 | 2012 | 79.813602163463 | 2011 | 79.639494480807 | 2010 | 79.434118628368 | 2009 | 79.162247085717 | 2008 | 78.878711535865 | 2007 | 78.579258505546 | 2006 | 78.270953243095 | 2005 | 77.952406276369 | 2004 | 77.609859500365 | 2003 | 77.255718372518 | 2002 | 76.888790201252 | 2001 | 76.496786446896 | 2000 | 76.159470612313 | 1999 | 75.942563849927 | 1998 | 75.721786911651 | 1997 | 75.499577890767 | 1996 | 75.275139218765 | 1995 | 75.038198861831 | 1994 | 74.791754642676 | 1993 | 74.544034027539 | 1992 | 74.297794694465 | 1991 | 74.02920056502 | 1990 | 73.743939579747 | 1989 | 73.487086611893 | 1988 | 73.232473253724 | 1987 | 72.949697078418 | 1986 | 72.655743293075 | 1985 | 72.388995861601 | 1984 | 72.151017989723 | 1983 | 71.907617653102 | 1982 | 71.651041006103 | 1981 | 71.375235166955 | 1980 | 71.057889096717 | 1979 | 70.763616716778 | 1978 | 70.471827205022 | 1977 | 70.180561163936 | 1976 | 69.895889635848 | 1975 | 69.608482013988 | 1974 | 69.265908411542 | 1973 | 68.907919752532 | 1972 | 68.54719168532 | 1971 | 68.178687339201 | 1970 | 67.776423597776 | 1969 | 67.322163985394 | 1968 | 66.851189947913 | 1967 | 66.352296016581 | 1966 | 65.838194626876 | 1965 | 65.3358775638 | 1964 | 64.820334587268 | 1963 | 64.303417944868 | 1962 | 63.785802141832 | 1961 | 63.284888156995 | 1960 | 62.78886842625 |
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