Year | Value | 2022 | 14.417 | 2021 | 14.058 | 2020 | 13.708 | 2019 | 13.366 | 2018 | 13.032 | 2017 | 12.706 | 2016 | 12.388 | 2015 | 12.078 | 2014 | 11.776 | 2013 | 11.482 | 2012 | 11.194 | 2011 | 10.915 | 2010 | 10.642 | 2009 | 10.376 | 2008 | 10.118 | 2007 | 9.864 | 2006 | 9.617 | 2005 | 9.375 | 2004 | 9.139 | 2003 | 8.908 | 2002 | 8.682 | 2001 | 8.461 | 2000 | 8.246 | 1999 | 8.036 | 1998 | 7.83 | 1997 | 7.618 | 1996 | 7.412 | 1995 | 7.211 | 1994 | 7.014 | 1993 | 6.823 | 1992 | 6.637 | 1991 | 6.455 | 1990 | 6.271 | 1989 | 6.047 | 1988 | 5.83 | 1987 | 5.62 | 1986 | 5.417 | 1985 | 5.221 | 1984 | 5.033 | 1983 | 4.85 | 1982 | 4.674 | 1981 | 4.503 | 1980 | 4.339 | 1979 | 4.178 | 1978 | 4.005 | 1977 | 3.838 | 1976 | 3.678 | 1975 | 3.525 | 1974 | 3.377 | 1973 | 3.236 | 1972 | 3.101 | 1971 | 2.97 | 1970 | 2.845 | 1969 | 2.726 | 1968 | 2.611 | 1967 | 2.501 | 1966 | 2.395 | 1965 | 2.294 | 1964 | 2.233 | 1963 | 2.193 | 1962 | 2.154 | 1961 | 2.115 | 1960 | 2.077 |
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