Year | Value | 2021 | 10.509594049913 | 2020 | 10.561072002406 | 2019 | 10.906169817106 | 2018 | 11.22439257695 | 2017 | 11.505339156733 | 2016 | 11.809879697703 | 2015 | 11.950495275041 | 2014 | 12.10034703906 | 2013 | 12.115318972395 | 2012 | 12.357529724447 | 2011 | 12.447032492419 | 2010 | 12.666808611374 | 2009 | 12.810872689605 | 2008 | 13.083710079883 | 2007 | 13.120504836036 | 2006 | 13.088482888517 | 2005 | 12.957348595054 | 2004 | 13.083952331557 | 2003 | 13.152933574032 | 2002 | 13.232626923038 | 2001 | 13.494675741545 | 2000 | 13.784956914377 | 1999 | 13.781655469492 | 1998 | 13.955501444189 | 1997 | 14.096629974248 | 1996 | 14.312572580566 | 1995 | 14.438155218129 | 1994 | 14.792992990465 | 1993 | 15.048532495263 | 1992 | 15.369287487225 | 1991 | 15.626961670716 | 1990 | 15.86634407748 | 1989 | 15.847275032096 | 1988 | 15.955376399956 | 1987 | 15.975016667988 | 1986 | 16.109023842803 | 1985 | 16.362074357097 | 1984 | 16.482382425682 | 1983 | 16.720270136252 | 1982 | 17.05113873064 | 1981 | 17.187153750844 | 1980 | 17.485864832718 | 1979 | 17.619360623549 | 1978 | 17.55911924656 | 1977 | 17.837725357547 | 1976 | 18.018508385595 | 1975 | 18.346887508481 | 1974 | 18.8905213101 | 1973 | 19.130932698073 | 1972 | 19.587145597706 | 1971 | 20.370072184527 | 1970 | 20.651006849721 | 1969 | 20.731353880749 | 1968 | 20.863988068591 | 1967 | 21.2385222916 | 1966 | 21.069339307513 | 1965 | 22.108174176679 | 1964 | 22.778409073052 | 1963 | 22.900318671663 | 1962 | 23.029662355515 | 1961 | 23.335821804792 | 1960 | 23.447926338672 |
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