Year | Value | 2022 | 58.219 | 2021 | 57.878 | 2020 | 57.553 | 2019 | 57.242 | 2018 | 56.947 | 2017 | 56.667 | 2016 | 56.403 | 2015 | 56.155 | 2014 | 55.923 | 2013 | 55.706 | 2012 | 55.506 | 2011 | 55.322 | 2010 | 55.155 | 2009 | 54.987 | 2008 | 54.819 | 2007 | 54.651 | 2006 | 54.483 | 2005 | 54.315 | 2004 | 54.147 | 2003 | 53.979 | 2002 | 53.81 | 2001 | 53.642 | 2000 | 53.428 | 1999 | 53.198 | 1998 | 52.968 | 1997 | 52.739 | 1996 | 52.509 | 1995 | 52.279 | 1994 | 52.048 | 1993 | 51.818 | 1992 | 51.588 | 1991 | 51.357 | 1990 | 51.037 | 1989 | 50.687 | 1988 | 50.338 | 1987 | 49.987 | 1986 | 49.637 | 1985 | 49.287 | 1984 | 48.937 | 1983 | 48.587 | 1982 | 48.237 | 1981 | 47.887 | 1980 | 47.285 | 1979 | 46.597 | 1978 | 45.911 | 1977 | 45.227 | 1976 | 44.545 | 1975 | 43.864 | 1974 | 43.186 | 1973 | 42.511 | 1972 | 41.839 | 1971 | 41.168 | 1970 | 40.196 | 1969 | 39.13 | 1968 | 38.076 | 1967 | 37.03 | 1966 | 35.997 | 1965 | 34.977 | 1964 | 33.972 | 1963 | 32.979 | 1962 | 32.001 | 1961 | 31.04 | 1960 | 30.154 |
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