Year | Value | 2021 | 72.971 | 2020 | 74.406 | 2019 | 74.228 | 2018 | 73.802 | 2017 | 74.23 | 2016 | 74.281 | 2015 | 74.503 | 2014 | 74.215 | 2013 | 73.962 | 2012 | 73.716 | 2011 | 73.278 | 2010 | 72.725 | 2009 | 73.126 | 2008 | 71.47 | 2007 | 71.652 | 2006 | 71.256 | 2005 | 71.308 | 2004 | 71.076 | 2003 | 69.729 | 2002 | 70.488 | 2001 | 69.646 | 2000 | 69.102 | 1999 | 68.377 | 1998 | 69.16 | 1997 | 68.719 | 1996 | 69.009 | 1995 | 69.17 | 1994 | 68.511 | 1993 | 68.811 | 1992 | 68.391 | 1991 | 68.859 | 1990 | 68.272 | 1989 | 68.438 | 1988 | 68.419 | 1987 | 68.281 | 1986 | 68.279 | 1985 | 67.543 | 1984 | 67.592 | 1983 | 67.935 | 1982 | 67.646 | 1981 | 67.65 | 1980 | 67.572 | 1979 | 67.768 | 1978 | 67.438 | 1977 | 66.641 | 1976 | 66.273 | 1975 | 66.786 | 1974 | 66.848 | 1973 | 65.561 | 1972 | 64.947 | 1971 | 65.283 | 1970 | 65.057 | 1969 | 64.685 | 1968 | 64.668 | 1967 | 64.798 | 1966 | 64.376 | 1965 | 64.147 | 1964 | 63.843 | 1963 | 63.822 | 1962 | 63.427 | 1961 | 62.865 | 1960 | 63.026 |
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