Year | Value | 2022 | 26.159 | 2021 | 25.553 | 2020 | 24.954 | 2019 | 24.361 | 2018 | 23.774 | 2017 | 23.196 | 2016 | 22.624 | 2015 | 22.06 | 2014 | 21.504 | 2013 | 20.958 | 2012 | 20.424 | 2011 | 19.898 | 2010 | 19.383 | 2009 | 18.878 | 2008 | 18.384 | 2007 | 17.899 | 2006 | 17.425 | 2005 | 16.96 | 2004 | 16.507 | 2003 | 16.061 | 2002 | 15.626 | 2001 | 15.201 | 2000 | 14.786 | 1999 | 14.379 | 1998 | 13.982 | 1997 | 13.594 | 1996 | 13.216 | 1995 | 12.846 | 1994 | 12.485 | 1993 | 12.133 | 1992 | 11.79 | 1991 | 11.454 | 1990 | 11.076 | 1989 | 10.665 | 1988 | 10.267 | 1987 | 9.882 | 1986 | 9.511 | 1985 | 9.152 | 1984 | 8.805 | 1983 | 8.47 | 1982 | 8.147 | 1981 | 7.834 | 1980 | 7.534 | 1979 | 7.356 | 1978 | 7.276 | 1977 | 7.197 | 1976 | 7.118 | 1975 | 7.04 | 1974 | 6.963 | 1973 | 6.887 | 1972 | 6.812 | 1971 | 6.737 | 1970 | 6.664 | 1969 | 6.562 | 1968 | 6.283 | 1967 | 6.014 | 1966 | 5.757 | 1965 | 5.509 | 1964 | 5.273 | 1963 | 5.045 | 1962 | 4.826 | 1961 | 4.617 | 1960 | 4.417 |
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