Year | Value | 2021 | 10.114 | 2020 | 10.128 | 2019 | 10.295 | 2018 | 10.621 | 2017 | 10.877 | 2016 | 11.423 | 2015 | 11.634 | 2014 | 11.883 | 2013 | 11.553 | 2012 | 11.319 | 2011 | 10.475 | 2010 | 9.561 | 2009 | 8.876 | 2008 | 8.383 | 2007 | 8.027 | 2006 | 7.581 | 2005 | 7.223 | 2004 | 6.957 | 2003 | 6.96 | 2002 | 7.119 | 2001 | 7.575 | 2000 | 8.364 | 1999 | 9.278 | 1998 | 10.299 | 1997 | 11.466 | 1996 | 12.719 | 1995 | 14.018 | 1994 | 15.299 | 1993 | 16.409 | 1992 | 17.765 | 1991 | 18.81 | 1990 | 20.078 | 1989 | 20.938 | 1988 | 21.167 | 1987 | 22.171 | 1986 | 23.042 | 1985 | 23.436 | 1984 | 22.672 | 1983 | 21.586 | 1982 | 19.794 | 1981 | 17.763 | 1980 | 15.955 | 1979 | 14.082 | 1978 | 12.571 | 1977 | 11.739 | 1976 | 11.025 | 1975 | 10.72 | 1974 | 10.429 | 1973 | 10.214 | 1972 | 10.039 | 1971 | 10.069 | 1970 | 10.658 | 1969 | 11.909 | 1968 | 13.74 | 1967 | 16.086 | 1966 | 18.42 | 1965 | 20.799 | 1964 | 23.189 | 1963 | 25.247 | 1962 | 26.802 | 1961 | 28.893 | 1960 | 31.387 |
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