Year | Value | 2022 | 4.312 | 2021 | 4.397 | 2020 | 4.485 | 2019 | 4.574 | 2018 | 4.666 | 2017 | 4.76 | 2016 | 4.856 | 2015 | 4.955 | 2014 | 5.055 | 2013 | 5.157 | 2012 | 5.261 | 2011 | 5.388 | 2010 | 5.586 | 2009 | 5.791 | 2008 | 6.002 | 2007 | 6.221 | 2006 | 6.447 | 2005 | 6.681 | 2004 | 6.922 | 2003 | 7.172 | 2002 | 7.431 | 2001 | 7.697 | 2000 | 7.972 | 1999 | 8.257 | 1998 | 8.55 | 1997 | 8.853 | 1996 | 9.165 | 1995 | 9.458 | 1994 | 9.755 | 1993 | 10.06 | 1992 | 10.373 | 1991 | 10.696 | 1990 | 11.027 | 1989 | 11.367 | 1988 | 11.715 | 1987 | 12.074 | 1986 | 12.442 | 1985 | 12.806 | 1984 | 13.15 | 1983 | 13.502 | 1982 | 13.862 | 1981 | 14.231 | 1980 | 14.606 | 1979 | 14.991 | 1978 | 15.384 | 1977 | 15.785 | 1976 | 16.194 | 1975 | 16.613 | 1974 | 16.833 | 1973 | 17.03 | 1972 | 17.229 | 1971 | 17.43 | 1970 | 17.632 | 1969 | 17.836 | 1968 | 18.042 | 1967 | 18.251 | 1966 | 18.461 | 1965 | 18.672 | 1964 | 18.886 | 1963 | 19.101 | 1962 | 19.319 | 1961 | 19.538 | 1960 | 19.759 |
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