Year | Value | 2021 | 62.391 | 2020 | 61.576 | 2019 | 61.443 | 2018 | 60.646 | 2017 | 60.479 | 2016 | 59.757 | 2015 | 59.6 | 2014 | 58.979 | 2013 | 58.804 | 2012 | 58.099 | 2011 | 57.986 | 2010 | 57.364 | 2009 | 57.304 | 2008 | 56.845 | 2007 | 56.892 | 2006 | 56.568 | 2005 | 56.485 | 2004 | 56.123 | 2003 | 56.402 | 2002 | 56.141 | 2001 | 55.721 | 2000 | 55.811 | 1999 | 55.521 | 1998 | 55.339 | 1997 | 55.455 | 1996 | 55.327 | 1995 | 55.341 | 1994 | 55.328 | 1993 | 55.476 | 1992 | 55.651 | 1991 | 55.842 | 1990 | 56.01 | 1989 | 56.259 | 1988 | 56.229 | 1987 | 55.96 | 1986 | 55.515 | 1985 | 55.238 | 1984 | 54.757 | 1983 | 54.152 | 1982 | 53.783 | 1981 | 53.155 | 1980 | 52.445 | 1979 | 51.918 | 1978 | 51.42 | 1977 | 50.876 | 1976 | 50.504 | 1975 | 49.778 | 1974 | 49.219 | 1973 | 48.749 | 1972 | 48.265 | 1971 | 47.771 | 1970 | 47.278 | 1969 | 46.742 | 1968 | 46.446 | 1967 | 45.999 | 1966 | 45.572 | 1965 | 45.184 | 1964 | 44.983 | 1963 | 44.598 | 1962 | 44.434 | 1961 | 44.169 | 1960 | 44.026 |
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