Year | Value | 2021 | 78.457 | 2020 | 79.16 | 2019 | 80.183 | 2018 | 79.875 | 2017 | 80.694 | 2016 | 80.019 | 2015 | 79.037 | 2014 | 79.632 | 2013 | 79.469 | 2012 | 78.162 | 2011 | 78.742 | 2010 | 78.069 | 2009 | 77.726 | 2008 | 76.354 | 2007 | 77.213 | 2006 | 76.135 | 2005 | 76.223 | 2004 | 75.779 | 2003 | 74.843 | 2002 | 73.95 | 2001 | 72.984 | 2000 | 71.74 | 1999 | 70.108 | 1998 | 69.385 | 1997 | 68.887 | 1996 | 67.994 | 1995 | 66.137 | 1994 | 67.104 | 1993 | 67.058 | 1992 | 66.95 | 1991 | 66.814 | 1990 | 66.578 | 1989 | 65.81 | 1988 | 65.328 | 1987 | 64.523 | 1986 | 63.76 | 1985 | 63.063 | 1984 | 62.599 | 1983 | 62.426 | 1982 | 62.252 | 1981 | 62.109 | 1980 | 61.705 | 1979 | 61.41 | 1978 | 60.828 | 1977 | 60.214 | 1976 | 59.391 | 1975 | 58.789 | 1974 | 58.008 | 1973 | 57.279 | 1972 | 56.565 | 1971 | 55.851 | 1970 | 55.086 | 1969 | 54.369 | 1968 | 53.846 | 1967 | 53.37 | 1966 | 53.012 | 1965 | 52.696 | 1964 | 52.437 | 1963 | 52.197 | 1962 | 51.956 | 1961 | 51.782 | 1960 | 51.474 |
|