Year | Value | 2022 | 53.604 | 2021 | 53.799 | 2020 | 53.975 | 2019 | 54.134 | 2018 | 54.276 | 2017 | 54.399 | 2016 | 54.505 | 2015 | 54.594 | 2014 | 54.665 | 2013 | 54.718 | 2012 | 54.754 | 2011 | 54.772 | 2010 | 54.772 | 2009 | 54.755 | 2008 | 54.738 | 2007 | 54.721 | 2006 | 54.704 | 2005 | 54.687 | 2004 | 54.67 | 2003 | 54.653 | 2002 | 54.636 | 2001 | 54.619 | 2000 | 54.602 | 1999 | 54.418 | 1998 | 54.207 | 1997 | 53.997 | 1996 | 53.786 | 1995 | 53.575 | 1994 | 53.363 | 1993 | 53.152 | 1992 | 52.941 | 1991 | 52.729 | 1990 | 52.535 | 1989 | 52.345 | 1988 | 52.154 | 1987 | 51.963 | 1986 | 51.772 | 1985 | 51.581 | 1984 | 51.39 | 1983 | 51.199 | 1982 | 51.008 | 1981 | 50.817 | 1980 | 50.626 | 1979 | 50.463 | 1978 | 50.305 | 1977 | 50.146 | 1976 | 49.988 | 1975 | 49.829 | 1974 | 49.671 | 1973 | 49.512 | 1972 | 49.354 | 1971 | 49.195 | 1970 | 49.037 | 1969 | 48.762 | 1968 | 48.451 | 1967 | 48.14 | 1966 | 47.83 | 1965 | 47.519 | 1964 | 47.21 | 1963 | 46.899 | 1962 | 46.59 | 1961 | 46.28 | 1960 | 45.972 |
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