Year | Value | 2021 | 73.837 | 2020 | 71.795 | 2019 | 74.054 | 2018 | 73.85 | 2017 | 73.554 | 2016 | 73.256 | 2015 | 72.983 | 2014 | 72.812 | 2013 | 72.704 | 2012 | 72.615 | 2011 | 72.416 | 2010 | 72.009 | 2009 | 71.433 | 2008 | 70.586 | 2007 | 69.559 | 2006 | 68.725 | 2005 | 67.936 | 2004 | 67.423 | 2003 | 67.217 | 2002 | 67.18 | 2001 | 67.215 | 2000 | 67.234 | 1999 | 67.12 | 1998 | 65.209 | 1997 | 66.515 | 1996 | 66.052 | 1995 | 65.608 | 1994 | 65.181 | 1993 | 64.685 | 1992 | 64.266 | 1991 | 63.931 | 1990 | 63.096 | 1989 | 62.475 | 1988 | 60.3 | 1987 | 57.66 | 1986 | 57.775 | 1985 | 56.501 | 1984 | 56.131 | 1983 | 56.794 | 1982 | 58.605 | 1981 | 58.198 | 1980 | 57.914 | 1979 | 50.813 | 1978 | 53.571 | 1977 | 56.243 | 1976 | 56.299 | 1975 | 56.036 | 1974 | 55.85 | 1973 | 55.725 | 1972 | 48.626 | 1971 | 55.322 | 1970 | 54.95 | 1969 | 54.324 | 1968 | 53.465 | 1967 | 52.394 | 1966 | 51.316 | 1965 | 50.193 | 1964 | 49.169 | 1963 | 48.304 | 1962 | 47.575 | 1961 | 46.948 | 1960 | 46.125 |
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