Year | Value | 2021 | 70.26 | 2020 | 68.765 | 2019 | 74.699 | 2018 | 74.623 | 2017 | 74.577 | 2016 | 74.41 | 2015 | 74.391 | 2014 | 74.146 | 2013 | 73.777 | 2012 | 73.332 | 2011 | 72.879 | 2010 | 72.458 | 2009 | 72.154 | 2008 | 71.945 | 2007 | 71.832 | 2006 | 71.714 | 2005 | 71.574 | 2004 | 71.35 | 2003 | 71.031 | 2002 | 70.642 | 2001 | 70.231 | 2000 | 69.799 | 1999 | 69.397 | 1998 | 68.972 | 1997 | 68.599 | 1996 | 68.277 | 1995 | 67.95 | 1994 | 67.657 | 1993 | 67.258 | 1992 | 67.012 | 1991 | 66.55 | 1990 | 66.314 | 1989 | 65.809 | 1988 | 65.244 | 1987 | 64.625 | 1986 | 63.995 | 1985 | 63.383 | 1984 | 62.83 | 1983 | 62.26 | 1982 | 61.893 | 1981 | 61.49 | 1980 | 61.064 | 1979 | 60.62 | 1978 | 60.136 | 1977 | 59.605 | 1976 | 58.997 | 1975 | 58.39 | 1974 | 57.727 | 1973 | 57.083 | 1972 | 56.488 | 1971 | 55.942 | 1970 | 55.481 | 1969 | 55.003 | 1968 | 54.844 | 1967 | 54.579 | 1966 | 54.311 | 1965 | 54.036 | 1964 | 53.676 | 1963 | 53.25 | 1962 | 52.778 | 1961 | 52.281 | 1960 | 51.762 |
|