Year | Value | 2015 | 85.667136915597 | 2014 | 84.255803046358 | 2013 | 82.711235635138 | 2012 | 90.429997761143 | 2011 | 87.183991474328 | 2010 | 87.245186930924 | 2009 | 89.861793155765 | 2008 | 89.528571737701 | 2007 | 90.678197437905 | 2006 | 88.768277201371 | 2005 | 88.702198231433 | 2004 | 87.047019052581 | 2003 | 86.942471922813 | 2002 | 89.273363491912 | 2001 | 87.638217562061 | 2000 | 84.360537561074 | 1999 | 81.518418005688 | 1998 | 80.611264168756 | 1997 | 76.151011875172 | 1996 | 68.839933200247 | 1995 | 61.508272094629 | 1994 | 66.296568668527 | 1993 | 65.703916586659 | 1992 | 68.794762024781 | 1991 | 67.113386104254 | 1990 | 65.01930006393 | 1989 | 59.662879056451 | 1988 | 68.56459302921 | 1987 | 67.418316888503 | 1986 | 70.257481428318 | 1985 | 67.020346234292 | 1984 | 56.20940442427 | 1983 | 60.886669919767 | 1982 | 63.081745573272 | 1981 | 69.891454179964 | 1980 | 77.0073534233 | 1979 | 82.84813557538 | 1978 | 84.508008900923 | 1977 | 81.587204769884 | 1976 | 79.382538061765 | 1975 | 75.032052024626 | 1974 | 81.613705310694 | 1973 | 83.781362318488 | 1972 | 79.422220161524 | 1971 | 78.812688668854 | 1970 | 76.330358534873 | 1969 | 71.960451600804 | 1968 | 68.817895975721 | 1967 | 73.477010984504 | 1966 | 73.235802373414 | 1965 | 74.344559473533 | 1964 | 68.553905076902 | 1963 | 67.559181173895 | 1962 | 66.425937185205 | 1961 | 65.72257496427 | 1960 | 62.95183912258 |
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