Year | Value | 2022 | 46.837 | 2021 | 46.235 | 2020 | 45.638 | 2019 | 45.046 | 2018 | 44.46 | 2017 | 43.88 | 2016 | 43.307 | 2015 | 42.74 | 2014 | 42.18 | 2013 | 41.627 | 2012 | 41.082 | 2011 | 40.544 | 2010 | 40.013 | 2009 | 39.491 | 2008 | 38.976 | 2007 | 38.47 | 2006 | 37.971 | 2005 | 37.481 | 2004 | 37 | 2003 | 36.526 | 2002 | 36.055 | 2001 | 35.587 | 2000 | 35.122 | 1999 | 34.659 | 1998 | 34.199 | 1997 | 33.742 | 1996 | 33.289 | 1995 | 32.838 | 1994 | 32.39 | 1993 | 31.946 | 1992 | 31.506 | 1991 | 31.067 | 1990 | 30.633 | 1989 | 30.202 | 1988 | 29.775 | 1987 | 29.35 | 1986 | 28.93 | 1985 | 28.513 | 1984 | 28.1 | 1983 | 27.84 | 1982 | 27.583 | 1981 | 27.327 | 1980 | 27.072 | 1979 | 26.819 | 1978 | 26.567 | 1977 | 26.317 | 1976 | 26.068 | 1975 | 25.821 | 1974 | 25.575 | 1973 | 25.331 | 1972 | 25.089 | 1971 | 24.847 | 1970 | 24.608 | 1969 | 24.37 | 1968 | 24.134 | 1967 | 23.899 | 1966 | 23.666 | 1965 | 23.434 | 1964 | 23.204 | 1963 | 22.976 | 1962 | 22.749 | 1961 | 22.523 | 1960 | 22.3 |
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