Year | Value | 2021 | 66.014 | 2020 | 66.385 | 2019 | 66.825 | 2018 | 66.049 | 2017 | 65.922 | 2016 | 65.873 | 2015 | 64.987 | 2014 | 64.924 | 2013 | 64.072 | 2012 | 63.971 | 2011 | 63.233 | 2010 | 62.485 | 2009 | 62.461 | 2008 | 61.77 | 2007 | 61.661 | 2006 | 61.217 | 2005 | 61.091 | 2004 | 60.483 | 2003 | 60.434 | 2002 | 59.852 | 2001 | 59.196 | 2000 | 59.289 | 1999 | 59.224 | 1998 | 58.782 | 1997 | 58.434 | 1996 | 57.918 | 1995 | 57.578 | 1994 | 57.14 | 1993 | 57.341 | 1992 | 57.522 | 1991 | 57.356 | 1990 | 57.087 | 1989 | 56.857 | 1988 | 56.281 | 1987 | 55.607 | 1986 | 55.054 | 1985 | 54.372 | 1984 | 53.911 | 1983 | 53.48 | 1982 | 53.226 | 1981 | 53.312 | 1980 | 53.024 | 1979 | 53.017 | 1978 | 52.554 | 1977 | 52.035 | 1976 | 51.857 | 1975 | 51.349 | 1974 | 50.904 | 1973 | 50.53 | 1972 | 50.172 | 1971 | 50.022 | 1970 | 50.043 | 1969 | 49.667 | 1968 | 49.685 | 1967 | 49.985 | 1966 | 49.972 | 1965 | 50.078 | 1964 | 50.098 | 1963 | 49.742 | 1962 | 49.586 | 1961 | 49.518 | 1960 | 49.405 |
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