Year | Value | 2021 | 69.584 | 2020 | 70.416 | 2019 | 70.692 | 2018 | 70.561 | 2017 | 70.515 | 2016 | 70.224 | 2015 | 69.873 | 2014 | 69.736 | 2013 | 69.304 | 2012 | 68.915 | 2011 | 68.416 | 2010 | 67.712 | 2009 | 67.444 | 2008 | 66.47 | 2007 | 65.731 | 2006 | 65.059 | 2005 | 64.293 | 2004 | 63.552 | 2003 | 62.523 | 2002 | 61.226 | 2001 | 59.966 | 2000 | 58.625 | 1999 | 57.69 | 1998 | 57.028 | 1997 | 56.743 | 1996 | 56.346 | 1995 | 56.308 | 1994 | 56.035 | 1993 | 56.08 | 1992 | 56.021 | 1991 | 55.793 | 1990 | 55.434 | 1989 | 54.798 | 1988 | 54.276 | 1987 | 53.454 | 1986 | 51.506 | 1985 | 51.041 | 1984 | 50.235 | 1983 | 49.485 | 1982 | 48.736 | 1981 | 48.18 | 1980 | 47.57 | 1979 | 42.279 | 1978 | 36.982 | 1977 | 28.91 | 1976 | 12.013 | 1975 | 11.995 | 1974 | 39.803 | 1973 | 40.024 | 1972 | 40.224 | 1971 | 39.507 | 1970 | 39.129 | 1969 | 46.241 | 1968 | 45.793 | 1967 | 45.514 | 1966 | 45.363 | 1965 | 44.789 | 1964 | 44.398 | 1963 | 43.898 | 1962 | 43.316 | 1961 | 42.792 | 1960 | 42.361 |
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