Year | Value | 2021 | 74.267 | 2020 | 73.957 | 2019 | 75.09 | 2018 | 74.346 | 2017 | 73.95 | 2016 | 73.325 | 2015 | 72.739 | 2014 | 72.42 | 2013 | 72.54 | 2012 | 71.831 | 2011 | 70.467 | 2010 | 70.312 | 2009 | 68.863 | 2008 | 68.731 | 2007 | 68.213 | 2006 | 68.793 | 2005 | 68.817 | 2004 | 68.534 | 2003 | 68.218 | 2002 | 67.627 | 2001 | 66.66 | 2000 | 66.109 | 1999 | 66.022 | 1998 | 63.947 | 1997 | 61.315 | 1996 | 58.62 | 1995 | 59.005 | 1994 | 58.095 | 1993 | 57.25 | 1992 | 57.049 | 1991 | 53.07 | 1990 | 54.757 | 1989 | 54.022 | 1988 | 54.406 | 1987 | 54.303 | 1986 | 53.64 | 1985 | 53.32 | 1984 | 52.707 | 1983 | 52.019 | 1982 | 51.521 | 1981 | 51.083 | 1980 | 50.81 | 1979 | 50.3 | 1978 | 50.109 | 1977 | 50.134 | 1976 | 49.357 | 1975 | 49.284 | 1974 | 48.084 | 1973 | 48.813 | 1972 | 48.541 | 1971 | 32.225 | 1970 | 40.665 | 1969 | 48.21 | 1968 | 48.131 | 1967 | 47.958 | 1966 | 47.638 | 1965 | 45.79 | 1964 | 46.901 | 1963 | 45.745 | 1962 | 46.122 | 1961 | 45.192 | 1960 | 44.314 |
|