Year | Value | 2021 | 74.716 | 2020 | 76.788 | 2019 | 79.947 | 2018 | 79.898 | 2017 | 79.839 | 2016 | 79.799 | 2015 | 79.543 | 2014 | 79.313 | 2013 | 79.084 | 2012 | 78.9 | 2011 | 78.672 | 2010 | 78.498 | 2009 | 77.803 | 2008 | 77.736 | 2007 | 77.569 | 2006 | 77.59 | 2005 | 77.517 | 2004 | 77.401 | 2003 | 77.238 | 2002 | 76.769 | 2001 | 76.707 | 2000 | 76.533 | 1999 | 76.288 | 1998 | 76.083 | 1997 | 75.389 | 1996 | 75.14 | 1995 | 74.865 | 1994 | 74.258 | 1993 | 73.938 | 1992 | 73.364 | 1991 | 72.989 | 1990 | 72.326 | 1989 | 71.684 | 1988 | 70.983 | 1987 | 70.201 | 1986 | 69.428 | 1985 | 68.642 | 1984 | 67.432 | 1983 | 66.489 | 1982 | 65.257 | 1981 | 63.909 | 1980 | 62.689 | 1979 | 61.309 | 1978 | 59.873 | 1977 | 58.391 | 1976 | 57.371 | 1975 | 55.87 | 1974 | 54.697 | 1973 | 53.439 | 1972 | 52.2 | 1971 | 50.98 | 1970 | 49.753 | 1969 | 48.732 | 1968 | 47.521 | 1967 | 46.254 | 1966 | 45.053 | 1965 | 43.869 | 1964 | 42.608 | 1963 | 41.401 | 1962 | 40.177 | 1961 | 38.825 | 1960 | 37.486 |
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