Year | Value | 2021 | 73.772 | 2020 | 75.292 | 2019 | 75.993 | 2018 | 75.95 | 2017 | 75.845 | 2016 | 75.786 | 2015 | 75.692 | 2014 | 75.65 | 2013 | 75.65 | 2012 | 75.55 | 2011 | 75.46 | 2010 | 75.421 | 2009 | 75.267 | 2008 | 75.185 | 2007 | 75.072 | 2006 | 74.921 | 2005 | 74.764 | 2004 | 74.49 | 2003 | 74.305 | 2002 | 74.059 | 2001 | 73.816 | 2000 | 73.69 | 1999 | 73.508 | 1998 | 73.169 | 1997 | 72.863 | 1996 | 72.38 | 1995 | 71.988 | 1994 | 71.615 | 1993 | 71.235 | 1992 | 70.701 | 1991 | 70.521 | 1990 | 70.11 | 1989 | 69.671 | 1988 | 69.569 | 1987 | 68.899 | 1986 | 68.228 | 1985 | 67.589 | 1984 | 66.82 | 1983 | 66.137 | 1982 | 65.417 | 1981 | 64.691 | 1980 | 63.975 | 1979 | 63.211 | 1978 | 62.338 | 1977 | 61.543 | 1976 | 60.426 | 1975 | 59.468 | 1974 | 58.282 | 1973 | 57.2 | 1972 | 56.107 | 1971 | 54.835 | 1970 | 53.87 | 1969 | 52.523 | 1968 | 51.573 | 1967 | 50.466 | 1966 | 49.327 | 1965 | 48.428 | 1964 | 47.365 | 1963 | 46.5 | 1962 | 45.513 | 1961 | 44.146 | 1960 | 43.94 |
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