Year | Value | 2021 | 79.486 | 2020 | 82.217 | 2019 | 82.996 | 2018 | 82.783 | 2017 | 82.618 | 2016 | 82.488 | 2015 | 82.354 | 2014 | 82.214 | 2013 | 82.017 | 2012 | 81.759 | 2011 | 81.429 | 2010 | 81.039 | 2009 | 80.665 | 2008 | 80.301 | 2007 | 80.02 | 2006 | 79.842 | 2005 | 79.736 | 2004 | 79.696 | 2003 | 79.703 | 2002 | 79.711 | 2001 | 79.685 | 2000 | 79.536 | 1999 | 79.18 | 1998 | 78.386 | 1997 | 77.7 | 1996 | 76.833 | 1995 | 76.008 | 1994 | 75.311 | 1993 | 74.804 | 1992 | 74.419 | 1991 | 74.149 | 1990 | 73.983 | 1989 | 73.787 | 1988 | 73.468 | 1987 | 72.897 | 1986 | 72.471 | 1985 | 71.644 | 1984 | 70.772 | 1983 | 69.804 | 1982 | 68.884 | 1981 | 68.012 | 1980 | 67.14 | 1979 | 66.235 | 1978 | 65.549 | 1977 | 64.936 | 1976 | 64.378 | 1975 | 63.889 | 1974 | 63.501 | 1973 | 63.206 | 1972 | 62.936 | 1971 | 62.681 | 1970 | 62.429 | 1969 | 62.173 | 1968 | 61.909 | 1967 | 61.63 | 1966 | 61.334 | 1965 | 61.045 | 1964 | 60.781 | 1963 | 60.527 | 1962 | 60.271 | 1961 | 59.996 | 1960 | 59.675 |
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