Year | Value | 2021 | 71.694 | 2020 | 72.765 | 2019 | 73.47 | 2018 | 73.341 | 2017 | 73.57 | 2016 | 73.569 | 2015 | 73.297 | 2014 | 73.099 | 2013 | 72.628 | 2012 | 72.412 | 2011 | 72.39 | 2010 | 72.128 | 2009 | 71.95 | 2008 | 71.332 | 2007 | 71.568 | 2006 | 71.394 | 2005 | 71.13 | 2004 | 70.567 | 2003 | 70.333 | 2002 | 70.024 | 2001 | 69.606 | 2000 | 69.575 | 1999 | 69.319 | 1998 | 69.102 | 1997 | 69.059 | 1996 | 68.974 | 1995 | 68.851 | 1994 | 68.554 | 1993 | 67.656 | 1992 | 67.783 | 1991 | 68.245 | 1990 | 68.389 | 1989 | 68.353 | 1988 | 68.528 | 1987 | 68.251 | 1986 | 68.445 | 1985 | 68.368 | 1984 | 67.994 | 1983 | 67.942 | 1982 | 67.903 | 1981 | 67.634 | 1980 | 67.173 | 1979 | 67.074 | 1978 | 66.695 | 1977 | 66.471 | 1976 | 66.029 | 1975 | 65.874 | 1974 | 65.591 | 1973 | 65.421 | 1972 | 65.072 | 1971 | 64.753 | 1970 | 64.431 | 1969 | 64.205 | 1968 | 63.775 | 1967 | 63.292 | 1966 | 63.075 | 1965 | 62.852 | 1964 | 62.333 | 1963 | 62.228 | 1962 | 61.858 | 1961 | 61.416 | 1960 | 61.222 |
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