Year | Value | 2021 | 79.947138723127 | 2020 | 80.276304238185 | 2019 | 81.433979150376 | 2018 | 81.188070055051 | 2017 | 81.059524961561 | 2016 | 80.944380057223 | 2015 | 80.621023995917 | 2014 | 80.768265244546 | 2013 | 80.466198791989 | 2012 | 80.163848162237 | 2011 | 80.069489418081 | 2010 | 79.609684141463 | 2009 | 79.384161232024 | 2008 | 79.067342670546 | 2007 | 78.881081128043 | 2006 | 78.580011936399 | 2005 | 78.150481919045 | 2004 | 78.02754479901 | 2003 | 77.572942005874 | 2002 | 77.502721405736 | 2001 | 77.429020849171 | 2000 | 77.211093681661 | 1999 | 76.936767891116 | 1998 | 76.976483574221 | 1997 | 76.725642200665 | 1996 | 76.436004777823 | 1995 | 76.124541409879 | 1994 | 76.093595090721 | 1993 | 75.793084585548 | 1992 | 75.96379775581 | 1991 | 76.162949883369 | 1990 | 76.214244018735 | 1989 | 76.153490614693 | 1988 | 75.948034248516 | 1987 | 75.831202641384 | 1986 | 75.598931342165 | 1985 | 75.156283564032 | 1984 | 75.061424998402 | 1983 | 74.925102234107 | 1982 | 74.886381369078 | 1981 | 74.605561393118 | 1980 | 74.325626259304 | 1979 | 74.182993854261 | 1978 | 74.033341738125 | 1977 | 73.940931428821 | 1976 | 73.620846842223 | 1975 | 73.476867605206 | 1974 | 73.463724500881 | 1973 | 73.177191984984 | 1972 | 73.055630277562 | 1971 | 72.846712883047 | 1970 | 72.597217986872 | 1969 | 72.054896271386 | 1968 | 72.177205199403 | 1967 | 72.126003697746 | 1966 | 72.058964135636 | 1965 | 71.805944752626 | 1964 | 71.787909731823 | 1963 | 71.231843619089 | 1962 | 70.859633628454 | 1961 | 70.954831810995 | 1960 | 70.641632065295 |
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