Year | Value | 2022 | 12.088 | 2021 | 12.183 | 2020 | 12.273 | 2019 | 12.357 | 2018 | 12.436 | 2017 | 12.51 | 2016 | 12.578 | 2015 | 12.64 | 2014 | 12.697 | 2013 | 12.754 | 2012 | 12.811 | 2011 | 12.868 | 2010 | 12.926 | 2009 | 12.983 | 2008 | 13.041 | 2007 | 13.1 | 2006 | 13.158 | 2005 | 13.217 | 2004 | 13.275 | 2003 | 13.335 | 2002 | 13.394 | 2001 | 13.637 | 2000 | 13.927 | 1999 | 14.222 | 1998 | 14.523 | 1997 | 14.828 | 1996 | 15.139 | 1995 | 15.455 | 1994 | 15.777 | 1993 | 16.104 | 1992 | 16.436 | 1991 | 16.602 | 1990 | 16.729 | 1989 | 16.857 | 1988 | 16.986 | 1987 | 17.115 | 1986 | 17.245 | 1985 | 17.376 | 1984 | 17.508 | 1983 | 17.641 | 1982 | 17.774 | 1981 | 18.222 | 1980 | 18.757 | 1979 | 19.305 | 1978 | 19.864 | 1977 | 20.435 | 1976 | 21.018 | 1975 | 21.614 | 1974 | 22.222 | 1973 | 22.841 | 1972 | 23.472 | 1971 | 24.117 | 1970 | 24.773 | 1969 | 25.453 | 1968 | 26.146 | 1967 | 26.854 | 1966 | 27.573 | 1965 | 28.304 | 1964 | 29.045 | 1963 | 29.8 | 1962 | 30.565 | 1961 | 31.34 | 1960 | 32.164 |
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