Year | Value | 2021 | 76.442 | 2020 | 78.136 | 2019 | 79.721 | 2018 | 79.66 | 2017 | 79.535 | 2016 | 79.44 | 2015 | 79.292 | 2014 | 79.139 | 2013 | 78.972 | 2012 | 78.787 | 2011 | 78.548 | 2010 | 78.301 | 2009 | 78.054 | 2008 | 77.731 | 2007 | 77.391 | 2006 | 77.075 | 2005 | 76.766 | 2004 | 76.495 | 2003 | 76.252 | 2002 | 75.981 | 2001 | 75.66 | 2000 | 75.542 | 1999 | 75.195 | 1998 | 75.053 | 1997 | 74.798 | 1996 | 74.5 | 1995 | 74.24 | 1994 | 73.969 | 1993 | 73.757 | 1992 | 73.533 | 1991 | 73.296 | 1990 | 73.067 | 1989 | 72.781 | 1988 | 72.44 | 1987 | 71.992 | 1986 | 71.716 | 1985 | 69.186 | 1984 | 71.05 | 1983 | 70.685 | 1982 | 70.395 | 1981 | 70.019 | 1980 | 69.626 | 1979 | 69.063 | 1978 | 68.579 | 1977 | 67.959 | 1976 | 67.297 | 1975 | 66.639 | 1974 | 65.929 | 1973 | 65.314 | 1972 | 64.745 | 1971 | 64.177 | 1970 | 63.668 | 1969 | 63.274 | 1968 | 62.894 | 1967 | 62.527 | 1966 | 62.19 | 1965 | 61.803 | 1964 | 61.368 | 1963 | 60.87 | 1962 | 60.309 | 1961 | 59.765 | 1960 | 59.187 |
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