Year | Value | 2021 | 26.087353523056 | 2020 | 26.087353523056 | 2019 | 26.087353523056 | 2018 | 26.087353523056 | 2017 | 26.087353523056 | 2016 | 26.087353523056 | 2015 | 26.084218535991 | 2014 | 24.620301323999 | 2013 | 24.529904124182 | 2012 | 23.829554101354 | 2011 | 22.920712220362 | 2010 | 22.490640693958 | 2009 | 21.975346218232 | 2008 | 21.763506315629 | 2007 | 21.632019479531 | 2006 | 21.534621823162 | 2005 | 21.714837924212 | 2004 | 21.706589560189 | 2003 | 21.659534317455 | 2002 | 21.419875209253 | 2001 | 21.144422462335 | 2000 | 21.119159945214 | 1999 | 21.144726830011 | 1998 | 21.137422005783 | 1997 | 21.180033480444 | 1996 | 21.187338304672 | 1995 | 21.202252320803 | 1994 | 21.278039872166 | 1993 | 20.975194034393 | 1992 | 20.71678587734 | 1991 | 20.680261756201 | 1990 | 20.56490640694 | 1989 | 20.458682087962 | 1988 | 19.430223710242 | 1987 | 18.485466443464 | 1986 | 17.409526708264 | 1985 | 16.483792421245 | 1984 | 15.876183229341 | 1983 | 15.843676761528 | 1982 | 15.546461725765 | 1981 | 15.354710089788 | 1980 | 14.965758636433 | 1979 | 14.728686653477 | 1978 | 14.396591082027 | 1977 | 13.911855120986 | 1976 | 13.512768224015 | 1975 | 13.252594734439 | 1974 | 12.848790138487 | 1973 | 12.664404200274 | 1972 | 12.418292497337 | 1971 | 12.049246690001 | 1970 | 11.824714655304 | 1969 | 11.431867295693 | 1968 | 11.262517120682 | 1967 | 10.871039415614 | 1966 | 10.677613757419 | 1965 | 10.644772485162 | 1964 | 10.159853903515 | 1963 | 9.9706893927865 | 1962 | 9.5904732917364 | 1961 | 9.3889514533557 |
|