Year | Value | 2021 | 77.345010371053 | 2020 | 76.269493738957 | 2019 | 75.839287086118 | 2018 | 73.959437658447 | 2017 | 73.45263885688 | 2016 | 73.113697472536 | 2015 | 72.476300222786 | 2014 | 71.598678650995 | 2013 | 71.276023661366 | 2012 | 70.085273104402 | 2011 | 70.123684412691 | 2010 | 70.991779980026 | 2009 | 71.030191288315 | 2008 | 71.08396711992 | 2007 | 71.183836521472 | 2006 | 71.291388184682 | 2005 | 71.529538296074 | 2004 | 71.621725435968 | 2003 | 71.660136744257 | 2002 | 71.852193285703 | 2001 | 72.236306368595 | 2000 | 72.213259583621 | 1999 | 72.873934086195 | 1998 | 72.474456479988 | 1997 | 71.944380425597 | 1996 | 71.6524544826 | 1995 | 72.013520780518 | 1994 | 71.890604593993 | 1993 | 72.566643619882 | 1992 | 73.357916570638 | 1991 | 79.280940308827 | 1990 | 79.787969578244 | 1989 | 80.22585849274 | 1988 | 80.102942306215 | 1987 | 77.706076668971 | 1986 | 77.137589306292 | 1985 | 77.030037643082 | 1984 | 77.283552277791 | 1983 | 76.546055158639 | 1982 | 76.653606821848 | 1981 | 76.676653606822 | 1980 | 76.722747176769 | 1979 | 76.692018130137 | 1978 | 76.722747176769 | 1977 | 76.7534762234 | 1976 | 76.807252055005 | 1975 | 76.853345624952 | 1974 | 76.738111700085 | 1973 | 76.738111700085 | 1972 | 76.7534762234 | 1971 | 74.479526772682 | 1970 | 74.494891295998 | 1969 | 74.325881539525 | 1968 | 74.279787969578 | 1967 | 74.479526772682 | 1966 | 74.133824998079 | 1965 | 74.033955596528 | 1964 | 73.135130982561 | 1963 | 72.827840516248 | 1962 | 72.804793731275 | 1961 | 72.827840516248 |
|