Year | Value | 2021 | 76.975 | 2020 | 79.321 | 2019 | 80.704 | 2018 | 80.474 | 2017 | 80.291 | 2016 | 80.142 | 2015 | 79.99 | 2014 | 79.847 | 2013 | 79.647 | 2012 | 79.374 | 2011 | 79.031 | 2010 | 78.632 | 2009 | 78.241 | 2008 | 77.867 | 2007 | 77.564 | 2006 | 77.414 | 2005 | 77.312 | 2004 | 77.264 | 2003 | 77.251 | 2002 | 77.239 | 2001 | 77.194 | 2000 | 77.051 | 1999 | 76.733 | 1998 | 76.044 | 1997 | 75.453 | 1996 | 74.733 | 1995 | 74.155 | 1994 | 73.595 | 1993 | 73.112 | 1992 | 72.734 | 1991 | 72.466 | 1990 | 72.334 | 1989 | 72.176 | 1988 | 71.934 | 1987 | 71.417 | 1986 | 70.999 | 1985 | 70.216 | 1984 | 69.45 | 1983 | 68.505 | 1982 | 67.577 | 1981 | 66.742 | 1980 | 65.871 | 1979 | 64.974 | 1978 | 64.334 | 1977 | 63.73 | 1976 | 63.178 | 1975 | 62.691 | 1974 | 62.306 | 1973 | 61.997 | 1972 | 61.708 | 1971 | 61.428 | 1970 | 61.152 | 1969 | 60.876 | 1968 | 60.599 | 1967 | 60.319 | 1966 | 60.031 | 1965 | 59.779 | 1964 | 59.543 | 1963 | 59.313 | 1962 | 59.079 | 1961 | 58.819 | 1960 | 58.508 |
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