Year | Value | 2021 | 80.6 | 2020 | 80.5 | 2019 | 80.3 | 2018 | 79.7 | 2017 | 79.7 | 2016 | 79.3 | 2015 | 79 | 2014 | 78.6 | 2013 | 78.1 | 2012 | 77.6 | 2011 | 77.3 | 2010 | 76.8 | 2009 | 76.7 | 2008 | 76.2 | 2007 | 75.9 | 2006 | 75.4 | 2005 | 74.9 | 2004 | 74.3 | 2003 | 73.8 | 2002 | 73.4 | 2001 | 72.9 | 2000 | 72.3 | 1999 | 71.8 | 1998 | 71.2 | 1997 | 70.7 | 1996 | 70.2 | 1995 | 69.7 | 1994 | 69.3 | 1993 | 68.9 | 1992 | 68.4 | 1991 | 67.9 | 1990 | 67.5 | 1989 | 67 | 1988 | 66.5 | 1987 | 65.9 | 1986 | 65.3 | 1985 | 64.6 | 1984 | 64 | 1983 | 63.4 | 1982 | 62.9 | 1981 | 62.4 | 1980 | 61.9 | 1979 | 61.4 | 1978 | 61.1 | 1977 | 60.9 | 1976 | 60.6 | 1975 | 60.3 | 1974 | 60 | 1973 | 59.7 | 1972 | 59.4 | 1971 | 59.1 | 1970 | 58.7 | 1969 | 58.192 | 1968 | 57.719 | 1967 | 57.633 | 1966 | 56.073 | 1965 | 55.04 | 1964 | 54.186 | 1963 | 53.25 | 1962 | 53.14 | 1961 | 52.544 | 1960 | 51.95 |
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