Year | Value | 2021 | 77.192 | 2020 | 75.35 | 2019 | 78.249 | 2018 | 78.232 | 2017 | 78.24 | 2016 | 78.175 | 2015 | 77.916 | 2014 | 77.806 | 2013 | 77.463 | 2012 | 77.15 | 2011 | 76.836 | 2010 | 76.399 | 2009 | 75.87 | 2008 | 75.553 | 2007 | 75.396 | 2006 | 75.215 | 2005 | 75.306 | 2004 | 75.205 | 2003 | 75.497 | 2002 | 75.574 | 2001 | 75.448 | 2000 | 75.213 | 1999 | 74.833 | 1998 | 74.503 | 1997 | 74.163 | 1996 | 74.014 | 1995 | 73.909 | 1994 | 74.18 | 1993 | 74.22 | 1992 | 74.083 | 1991 | 71.822 | 1990 | 70.793 | 1989 | 73.089 | 1988 | 72.771 | 1987 | 72.527 | 1986 | 71.916 | 1985 | 71.389 | 1984 | 71.035 | 1983 | 70.339 | 1982 | 69.964 | 1981 | 69.516 | 1980 | 68.747 | 1979 | 68.098 | 1978 | 67.145 | 1977 | 66.526 | 1976 | 66.221 | 1975 | 66.034 | 1974 | 66.106 | 1973 | 65.814 | 1972 | 65.62 | 1971 | 65.1 | 1970 | 64.636 | 1969 | 63.93 | 1968 | 63.19 | 1967 | 62.554 | 1966 | 61.752 | 1965 | 60.898 | 1964 | 59.763 | 1963 | 58.919 | 1962 | 57.728 | 1961 | 56.674 | 1960 | 55.585 |
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