Year | Value | 2021 | 62.018 | 2020 | 62.633 | 2019 | 62.996 | 2018 | 62.783 | 2017 | 62.163 | 2016 | 61.599 | 2015 | 61.206 | 2014 | 60.433 | 2013 | 59.85 | 2012 | 59.161 | 2011 | 58.489 | 2010 | 57.971 | 2009 | 57.424 | 2008 | 56.989 | 2007 | 56.469 | 2006 | 56.181 | 2005 | 55.679 | 2004 | 55.64 | 2003 | 55.31 | 2002 | 54.865 | 2001 | 54.737 | 2000 | 54.562 | 1999 | 54.408 | 1998 | 54.203 | 1997 | 54.382 | 1996 | 54.447 | 1995 | 54.854 | 1994 | 55.081 | 1993 | 55.533 | 1992 | 55.989 | 1991 | 56.039 | 1990 | 56.17 | 1989 | 56.172 | 1988 | 56.154 | 1987 | 55.901 | 1986 | 55.073 | 1985 | 54.929 | 1984 | 54.402 | 1983 | 53.926 | 1982 | 53.251 | 1981 | 52.817 | 1980 | 52.44 | 1979 | 51.979 | 1978 | 51.662 | 1977 | 51.366 | 1976 | 51.251 | 1975 | 51.038 | 1974 | 50.847 | 1973 | 50.641 | 1972 | 50.193 | 1971 | 49.52 | 1970 | 48.783 | 1969 | 48.061 | 1968 | 47.214 | 1967 | 46.384 | 1966 | 45.635 | 1965 | 45.087 | 1964 | 44.498 | 1963 | 44.15 | 1962 | 43.771 | 1961 | 42.567 | 1960 | 42.047 |
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