Year | Value | 2021 | 67.093 | 2020 | 68.006 | 2019 | 68.526 | 2018 | 68.097 | 2017 | 67.75 | 2016 | 67.497 | 2015 | 66.879 | 2014 | 66.452 | 2013 | 66.072 | 2012 | 65.457 | 2011 | 65.262 | 2010 | 64.615 | 2009 | 63.923 | 2008 | 63.242 | 2007 | 62.543 | 2006 | 61.75 | 2005 | 60.915 | 2004 | 60.027 | 2003 | 59.122 | 2002 | 58.231 | 2001 | 57.564 | 2000 | 56.943 | 1999 | 56.609 | 1998 | 56.418 | 1997 | 56.591 | 1996 | 56.672 | 1995 | 56.839 | 1994 | 56.955 | 1993 | 56.996 | 1992 | 57.112 | 1991 | 57.139 | 1990 | 56.948 | 1989 | 56.438 | 1988 | 55.774 | 1987 | 54.819 | 1986 | 53.928 | 1985 | 52.758 | 1984 | 52.015 | 1983 | 51.153 | 1982 | 50.564 | 1981 | 49.85 | 1980 | 49.142 | 1979 | 48.196 | 1978 | 47.197 | 1977 | 46.152 | 1976 | 45.098 | 1975 | 44.099 | 1974 | 43.211 | 1973 | 42.557 | 1972 | 41.753 | 1971 | 41.219 | 1970 | 40.825 | 1969 | 40.459 | 1968 | 40.268 | 1967 | 40.083 | 1966 | 39.961 | 1965 | 39.838 | 1964 | 39.885 | 1963 | 39.882 | 1962 | 39.856 | 1961 | 39.917 | 1960 | 39.878 |
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