Year | Value | 2022 | 75.126 | 2021 | 74.934 | 2020 | 74.754 | 2019 | 74.587 | 2018 | 74.433 | 2017 | 74.292 | 2016 | 74.164 | 2015 | 74.05 | 2014 | 73.95 | 2013 | 73.863 | 2012 | 73.791 | 2011 | 73.732 | 2010 | 73.687 | 2009 | 73.642 | 2008 | 73.598 | 2007 | 73.553 | 2006 | 73.508 | 2005 | 73.463 | 2004 | 73.418 | 2003 | 73.373 | 2002 | 73.341 | 2001 | 73.346 | 2000 | 73.35 | 1999 | 73.354 | 1998 | 73.359 | 1997 | 73.363 | 1996 | 73.367 | 1995 | 73.372 | 1994 | 73.376 | 1993 | 73.381 | 1992 | 73.385 | 1991 | 73.389 | 1990 | 73.394 | 1989 | 73.398 | 1988 | 73.181 | 1987 | 72.765 | 1986 | 72.346 | 1985 | 71.923 | 1984 | 71.497 | 1983 | 71.066 | 1982 | 70.631 | 1981 | 70.193 | 1980 | 69.751 | 1979 | 69.305 | 1978 | 68.698 | 1977 | 67.95 | 1976 | 67.194 | 1975 | 66.427 | 1974 | 65.652 | 1973 | 64.869 | 1972 | 64.078 | 1971 | 63.278 | 1970 | 62.471 | 1969 | 61.638 | 1968 | 60.783 | 1967 | 59.918 | 1966 | 59.048 | 1965 | 58.173 | 1964 | 57.294 | 1963 | 56.408 | 1962 | 55.518 | 1961 | 54.626 | 1960 | 53.731 |
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