Year | Value | 2021 | 81.203 | 2020 | 81.391 | 2019 | 81.397 | 2018 | 81.382 | 2017 | 81.328 | 2016 | 81.056 | 2015 | 80.966 | 2014 | 80.771 | 2013 | 80.402 | 2012 | 80.109 | 2011 | 79.999 | 2010 | 79.665 | 2009 | 79.401 | 2008 | 78.981 | 2007 | 78.81 | 2006 | 78.371 | 2005 | 78.101 | 2004 | 77.944 | 2003 | 77.788 | 2002 | 77.487 | 2001 | 76.989 | 2000 | 76.568 | 1999 | 76.295 | 1998 | 76.182 | 1997 | 75.841 | 1996 | 75.522 | 1995 | 75.133 | 1994 | 74.72 | 1993 | 74.65 | 1992 | 74.177 | 1991 | 73.716 | 1990 | 73.539 | 1989 | 73.48 | 1988 | 73.129 | 1987 | 73.089 | 1986 | 72.651 | 1985 | 72.647 | 1984 | 72.255 | 1983 | 72.311 | 1982 | 71.981 | 1981 | 71.941 | 1980 | 71.95 | 1979 | 71.895 | 1978 | 71.767 | 1977 | 71.302 | 1976 | 71.04 | 1975 | 70.518 | 1974 | 55.23 | 1973 | 70.163 | 1972 | 69.811 | 1971 | 69.33 | 1970 | 68.927 | 1969 | 68.49 | 1968 | 68.273 | 1967 | 67.917 | 1966 | 67.495 | 1965 | 67.052 | 1964 | 62.79 | 1963 | 62.282 | 1962 | 65.424 | 1961 | 64.804 | 1960 | 64.187 |
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