Year | Value | 2021 | 78.647 | 2020 | 79.285 | 2019 | 80.681 | 2018 | 80.329 | 2017 | 80.085 | 2016 | 79.67 | 2015 | 80.188 | 2014 | 80.004 | 2013 | 79.927 | 2012 | 79.953 | 2011 | 79.322 | 2010 | 78.838 | 2009 | 79.07 | 2008 | 78.927 | 2007 | 78.515 | 2006 | 78.716 | 2005 | 78.527 | 2004 | 78.103 | 2003 | 77.276 | 2002 | 78.075 | 2001 | 77.59 | 2000 | 77.223 | 1999 | 76.989 | 1998 | 76.758 | 1997 | 76.464 | 1996 | 76.418 | 1995 | 76.243 | 1994 | 76.049 | 1993 | 75.94 | 1992 | 75.719 | 1991 | 75.635 | 1990 | 74.963 | 1989 | 74.735 | 1988 | 74.381 | 1987 | 74.004 | 1986 | 73.638 | 1985 | 73.253 | 1984 | 73.151 | 1983 | 73.21 | 1982 | 73.039 | 1981 | 73.089 | 1980 | 72.549 | 1979 | 72.548 | 1978 | 72.321 | 1977 | 72.173 | 1976 | 71.489 | 1975 | 71.269 | 1974 | 70.747 | 1973 | 70.35 | 1972 | 69.91 | 1971 | 69.493 | 1970 | 69.705 | 1969 | 69.047 | 1968 | 69.035 | 1967 | 68.99 | 1966 | 68.761 | 1965 | 68.493 | 1964 | 68.261 | 1963 | 68.285 | 1962 | 68.031 | 1961 | 68.031 | 1960 | 67.617 |
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