Year | Value | 2021 | 69.544 | 2020 | 70.279 | 2019 | 69.95 | 2018 | 69.702 | 2017 | 69.441 | 2016 | 69.167 | 2015 | 68.886 | 2014 | 68.557 | 2013 | 68.192 | 2012 | 67.79 | 2011 | 67.374 | 2010 | 66.989 | 2009 | 66.549 | 2008 | 66.035 | 2007 | 65.402 | 2006 | 64.728 | 2005 | 64 | 2004 | 63.319 | 2003 | 62.507 | 2002 | 61.776 | 2001 | 60.978 | 2000 | 60.159 | 1999 | 49.234 | 1998 | 50.994 | 1997 | 51.409 | 1996 | 50.58 | 1995 | 49.731 | 1994 | 49.922 | 1993 | 48.961 | 1992 | 47.966 | 1991 | 46.69 | 1990 | 46.554 | 1989 | 46.297 | 1988 | 44.849 | 1987 | 44.952 | 1986 | 43.377 | 1985 | 42.801 | 1984 | 42.994 | 1983 | 40.289 | 1982 | 39.378 | 1981 | 37.792 | 1980 | 36.383 | 1979 | 28.2 | 1978 | 27.21 | 1977 | 30.657 | 1976 | 32.678 | 1975 | 31.096 | 1974 | 38.504 | 1973 | 40.738 | 1972 | 40.059 | 1971 | 39.463 | 1970 | 38.905 | 1969 | 38.451 | 1968 | 37.95 | 1967 | 37.445 | 1966 | 36.718 | 1965 | 36.081 | 1964 | 35.321 | 1963 | 34.974 | 1962 | 34.676 | 1961 | 34.303 | 1960 | 33.936 |
|