Year | Value | 2021 | 75.149 | 2020 | 75.413 | 2019 | 76.776 | 2018 | 77.488 | 2017 | 77.494 | 2016 | 77.075 | 2015 | 76.572 | 2014 | 76.267 | 2013 | 76.158 | 2012 | 76.163 | 2011 | 76.189 | 2010 | 76.213 | 2009 | 75.961 | 2008 | 75.92 | 2007 | 75.677 | 2006 | 75.401 | 2005 | 75.083 | 2004 | 74.968 | 2003 | 74.682 | 2002 | 74.708 | 2001 | 73.903 | 2000 | 74.248 | 1999 | 73.803 | 1998 | 72.929 | 1997 | 72.559 | 1996 | 71.893 | 1995 | 71.283 | 1994 | 70.889 | 1993 | 70.308 | 1992 | 69.713 | 1991 | 69.066 | 1990 | 68.309 | 1989 | 67.271 | 1988 | 66.701 | 1987 | 65.725 | 1986 | 64.175 | 1985 | 63.854 | 1984 | 62.886 | 1983 | 61.918 | 1982 | 60.229 | 1981 | 60.278 | 1980 | 56.774 | 1979 | 59.661 | 1978 | 59.505 | 1977 | 59.142 | 1976 | 58.743 | 1975 | 58.251 | 1974 | 57.604 | 1973 | 56.798 | 1972 | 55.888 | 1971 | 55.025 | 1970 | 54.276 | 1969 | 53.777 | 1968 | 53.559 | 1967 | 53.47 | 1966 | 53.382 | 1965 | 53.114 | 1964 | 52.832 | 1963 | 52.294 | 1962 | 51.635 | 1961 | 50.902 | 1960 | 50.139 |
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