Year | Value | 2021 | 72.534 | 2020 | 73.987 | 2019 | 75.37 | 2018 | 75.318 | 2017 | 75.188 | 2016 | 75.078 | 2015 | 74.991 | 2014 | 74.632 | 2013 | 74.497 | 2012 | 74.169 | 2011 | 73.776 | 2010 | 73.278 | 2009 | 72.958 | 2008 | 72.451 | 2007 | 72.368 | 2006 | 72.306 | 2005 | 72.132 | 2004 | 72.07 | 2003 | 71.57 | 2002 | 71.441 | 2001 | 71.284 | 2000 | 70.807 | 1999 | 70.565 | 1998 | 63.617 | 1997 | 69.902 | 1996 | 69.695 | 1995 | 69.362 | 1994 | 68.809 | 1993 | 68.513 | 1992 | 68.25 | 1991 | 67.99 | 1990 | 67.449 | 1989 | 67.008 | 1988 | 66.414 | 1987 | 66.154 | 1986 | 65.56 | 1985 | 64.83 | 1984 | 64.647 | 1983 | 64.091 | 1982 | 63.425 | 1981 | 62.719 | 1980 | 62.192 | 1979 | 61.565 | 1978 | 60.947 | 1977 | 60.38 | 1976 | 59.794 | 1975 | 59.174 | 1974 | 52.965 | 1973 | 55.858 | 1972 | 57.344 | 1971 | 56.67 | 1970 | 56.173 | 1969 | 55.631 | 1968 | 55.07 | 1967 | 54.408 | 1966 | 53.883 | 1965 | 53.286 | 1964 | 52.726 | 1963 | 52.017 | 1962 | 51.439 | 1961 | 50.552 | 1960 | 50.225 |
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