Year | Value | 2021 | 69.284 | 2020 | 70.271 | 2019 | 70.954 | 2018 | 70.258 | 2017 | 70.066 | 2016 | 69.787 | 2015 | 69.085 | 2014 | 68.411 | 2013 | 68.236 | 2012 | 67.456 | 2011 | 67.174 | 2010 | 66.334 | 2009 | 65.524 | 2008 | 64.647 | 2007 | 63.87 | 2006 | 62.979 | 2005 | 62.072 | 2004 | 61.136 | 2003 | 60.338 | 2002 | 59.251 | 2001 | 58.73 | 2000 | 58.097 | 1999 | 57.846 | 1998 | 57.922 | 1997 | 58.21 | 1996 | 58.266 | 1995 | 58.554 | 1994 | 58.772 | 1993 | 59.013 | 1992 | 59.221 | 1991 | 59.321 | 1990 | 59.256 | 1989 | 58.696 | 1988 | 57.937 | 1987 | 56.793 | 1986 | 55.873 | 1985 | 54.576 | 1984 | 53.749 | 1983 | 52.726 | 1982 | 52.009 | 1981 | 51.256 | 1980 | 50.438 | 1979 | 49.347 | 1978 | 48.221 | 1977 | 47.008 | 1976 | 45.798 | 1975 | 44.67 | 1974 | 43.682 | 1973 | 42.924 | 1972 | 42.088 | 1971 | 41.534 | 1970 | 41.081 | 1969 | 40.587 | 1968 | 40.416 | 1967 | 40.252 | 1966 | 40.162 | 1965 | 39.948 | 1964 | 40.078 | 1963 | 40.047 | 1962 | 39.899 | 1961 | 40.022 | 1960 | 39.973 |
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