Year | Value | 2022 | 53.909 | 2021 | 53.82 | 2020 | 53.76 | 2019 | 53.729 | 2018 | 53.726 | 2017 | 53.751 | 2016 | 53.806 | 2015 | 53.889 | 2014 | 54 | 2013 | 54.14 | 2012 | 54.28 | 2011 | 54.42 | 2010 | 54.685 | 2009 | 54.96 | 2008 | 55.111 | 2007 | 55.261 | 2006 | 55.412 | 2005 | 55.563 | 2004 | 55.713 | 2003 | 55.863 | 2002 | 56.013 | 2001 | 56.163 | 2000 | 56.233 | 1999 | 56.294 | 1998 | 56.355 | 1997 | 56.416 | 1996 | 56.476 | 1995 | 56.537 | 1994 | 56.598 | 1993 | 56.659 | 1992 | 56.719 | 1991 | 56.78 | 1990 | 56.491 | 1989 | 56.03 | 1988 | 55.568 | 1987 | 55.105 | 1986 | 54.641 | 1985 | 54.176 | 1984 | 53.711 | 1983 | 53.244 | 1982 | 52.777 | 1981 | 52.31 | 1980 | 51.638 | 1979 | 50.56 | 1978 | 49.482 | 1977 | 48.405 | 1976 | 47.331 | 1975 | 46.257 | 1974 | 45.187 | 1973 | 44.122 | 1972 | 43.064 | 1971 | 42.009 | 1970 | 41.057 | 1969 | 40.243 | 1968 | 39.435 | 1967 | 38.63 | 1966 | 37.833 | 1965 | 37.043 | 1964 | 36.26 | 1963 | 35.483 | 1962 | 34.714 | 1961 | 33.953 | 1960 | 33.464 |
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