Year | Value | 2022 | 26.616 | 2021 | 26.314 | 2020 | 26.026 | 2019 | 25.754 | 2018 | 25.495 | 2017 | 25.25 | 2016 | 25.02 | 2015 | 24.803 | 2014 | 24.587 | 2013 | 24.373 | 2012 | 24.16 | 2011 | 23.948 | 2010 | 23.737 | 2009 | 23.528 | 2008 | 23.32 | 2007 | 23.113 | 2006 | 22.907 | 2005 | 22.703 | 2004 | 22.5 | 2003 | 22.353 | 2002 | 22.261 | 2001 | 22.169 | 2000 | 22.078 | 1999 | 21.986 | 1998 | 21.895 | 1997 | 21.805 | 1996 | 21.714 | 1995 | 21.624 | 1994 | 21.534 | 1993 | 21.444 | 1992 | 21.355 | 1991 | 21.266 | 1990 | 21.177 | 1989 | 21.088 | 1988 | 20.998 | 1987 | 20.314 | 1986 | 19.647 | 1985 | 18.997 | 1984 | 18.365 | 1983 | 17.747 | 1982 | 17.147 | 1981 | 16.562 | 1980 | 15.995 | 1979 | 15.442 | 1978 | 14.973 | 1977 | 14.517 | 1976 | 14.074 | 1975 | 13.641 | 1974 | 13.219 | 1973 | 12.809 | 1972 | 12.41 | 1971 | 12.021 | 1970 | 11.643 | 1969 | 11.275 | 1968 | 10.918 | 1967 | 10.57 | 1966 | 10.233 | 1965 | 9.904 | 1964 | 9.586 | 1963 | 9.276 | 1962 | 8.976 | 1961 | 8.684 | 1960 | 8.401 |
|