Year | Value | 2021 | 64.35 | 2020 | 64.862 | 2019 | 65.216 | 2018 | 64.947 | 2017 | 64.552 | 2016 | 64.213 | 2015 | 64.022 | 2014 | 63.556 | 2013 | 63.181 | 2012 | 62.965 | 2011 | 62.427 | 2010 | 61.976 | 2009 | 61.529 | 2008 | 60.906 | 2007 | 60.398 | 2006 | 59.907 | 2005 | 58.783 | 2004 | 58.22 | 2003 | 57.623 | 2002 | 57.129 | 2001 | 56.557 | 2000 | 53.816 | 1999 | 35.825 | 1998 | 42.542 | 1997 | 54.81 | 1996 | 54.356 | 1995 | 53.617 | 1994 | 52.731 | 1993 | 51.91 | 1992 | 51.059 | 1991 | 48.48 | 1990 | 47.688 | 1989 | 45.244 | 1988 | 45.559 | 1987 | 44.825 | 1986 | 44.882 | 1985 | 43.552 | 1984 | 43.247 | 1983 | 42.803 | 1982 | 42.237 | 1981 | 42.659 | 1980 | 42.242 | 1979 | 41.228 | 1978 | 40.803 | 1977 | 40.274 | 1976 | 39.845 | 1975 | 39.485 | 1974 | 39.936 | 1973 | 40.384 | 1972 | 39.963 | 1971 | 39.58 | 1970 | 39.157 | 1969 | 38.821 | 1968 | 38.368 | 1967 | 38.072 | 1966 | 37.924 | 1965 | 37.582 | 1964 | 37.21 | 1963 | 36.735 | 1962 | 36.328 | 1961 | 35.932 | 1960 | 35.417 |
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