Year | Value | 2022 | 52.666 | 2021 | 52.245 | 2020 | 51.836 | 2019 | 51.439 | 2018 | 51.054 | 2017 | 50.68 | 2016 | 50.319 | 2015 | 49.971 | 2014 | 49.634 | 2013 | 49.311 | 2012 | 49 | 2011 | 48.701 | 2010 | 48.403 | 2009 | 48.104 | 2008 | 47.807 | 2007 | 47.508 | 2006 | 47.21 | 2005 | 46.913 | 2004 | 46.616 | 2003 | 46.318 | 2002 | 46.005 | 2001 | 45.668 | 2000 | 45.332 | 1999 | 44.995 | 1998 | 44.659 | 1997 | 44.323 | 1996 | 43.989 | 1995 | 43.654 | 1994 | 43.32 | 1993 | 42.987 | 1992 | 42.655 | 1991 | 42.323 | 1990 | 41.992 | 1989 | 41.661 | 1988 | 41.332 | 1987 | 41.002 | 1986 | 40.674 | 1985 | 40.347 | 1984 | 40.021 | 1983 | 39.695 | 1982 | 39.37 | 1981 | 39.047 | 1980 | 38.724 | 1979 | 38.402 | 1978 | 38.081 | 1977 | 37.762 | 1976 | 37.443 | 1975 | 37.125 | 1974 | 36.809 | 1973 | 36.494 | 1972 | 36.177 | 1971 | 35.861 | 1970 | 35.545 | 1969 | 35.232 | 1968 | 34.919 | 1967 | 34.608 | 1966 | 34.298 | 1965 | 33.989 | 1964 | 33.682 | 1963 | 33.086 | 1962 | 32.424 | 1961 | 31.768 | 1960 | 31.121 |
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