Year | Value | 2021 | 76.472 | 2020 | 76.745 | 2019 | 77.894 | 2018 | 77.684 | 2017 | 78.015 | 2016 | 77.496 | 2015 | 77.035 | 2014 | 76.736 | 2013 | 76.579 | 2012 | 76.379 | 2011 | 76.451 | 2010 | 75.734 | 2009 | 75.941 | 2008 | 75.674 | 2007 | 75.043 | 2006 | 75.512 | 2005 | 74.912 | 2004 | 74.479 | 2003 | 74.306 | 2002 | 74.252 | 2001 | 73.6 | 2000 | 73.714 | 1999 | 72.93 | 1998 | 72.611 | 1997 | 72.335 | 1996 | 71.641 | 1995 | 71.429 | 1994 | 71.52 | 1993 | 71.171 | 1992 | 71.171 | 1991 | 70.376 | 1990 | 69.269 | 1989 | 69.244 | 1988 | 69.467 | 1987 | 69.76 | 1986 | 68.742 | 1985 | 67.998 | 1984 | 66.926 | 1983 | 66.624 | 1982 | 67.152 | 1981 | 66.969 | 1980 | 65.885 | 1979 | 65.263 | 1978 | 65.021 | 1977 | 64.501 | 1976 | 63.149 | 1975 | 63.446 | 1974 | 62.261 | 1973 | 60.696 | 1972 | 59.11 | 1971 | 59.995 | 1970 | 59.895 | 1969 | 59.234 | 1968 | 59.016 | 1967 | 58.047 | 1966 | 57.069 | 1965 | 57.032 | 1964 | 56.156 | 1963 | 54.438 | 1962 | 55.229 | 1961 | 55.243 | 1960 | 54.769 |
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