Year | Value | 2021 | 70.8 | 2020 | 73.2 | 2019 | 74 | 2018 | 74.5 | 2017 | 73.9 | 2016 | 74.1 | 2015 | 74.4 | 2014 | 74.1 | 2013 | 74.1 | 2012 | 74.2 | 2011 | 73.3 | 2010 | 73.6 | 2009 | 72.9 | 2008 | 72.6 | 2007 | 71.9 | 2006 | 71.4 | 2005 | 71.3 | 2004 | 71.482 | 2003 | 71.161 | 2002 | 70.906 | 2001 | 71.266 | 2000 | 71.058 | 1999 | 69.471 | 1998 | 69.363 | 1997 | 69.782 | 1996 | 70.064 | 1995 | 70.189 | 1994 | 70.187 | 1993 | 70.085 | 1992 | 69.66 | 1991 | 70.127 | 1990 | 70.562 | 1989 | 71.394 | 1988 | 71.939 | 1987 | 71.811 | 1986 | 70.784 | 1985 | 70.449 | 1984 | 69.059 | 1983 | 67.619 | 1982 | 67.907 | 1981 | 68.111 | 1980 | 68.474 | 1979 | 67.756 | 1978 | 68.262 | 1977 | 68.513 | 1976 | 68.768 | 1975 | 68.484 | 1974 | 68.451 | 1973 | 67.816 | 1972 | 67.542 | 1971 | 66.637 | 1970 | 66.8 | 1969 | 66.351 | 1968 | 66.625 | 1967 | 66.347 | 1966 | 66.362 | 1965 | 65.542 | 1964 | 64.812 | 1963 | 64.525 | 1962 | 63.637 | 1961 | 63.264 | 1960 | 62.758 |
|