Year | Value | 2021 | 21.551366165601 | 2020 | 21.551366165601 | 2019 | 21.551366165601 | 2018 | 21.592890955901 | 2017 | 21.592890955901 | 2016 | 21.7589901171 | 2015 | 21.8420396977 | 2014 | 21.8420396977 | 2013 | 21.8420396977 | 2012 | 21.8420396977 | 2011 | 21.8420396977 | 2010 | 22.257287600698 | 2009 | 22.174238020098 | 2008 | 22.008138858899 | 2007 | 21.592890955901 | 2006 | 21.592890955901 | 2005 | 21.592890955901 | 2004 | 21.177643052903 | 2003 | 21.177643052903 | 2002 | 21.177643052903 | 2001 | 21.177643052903 | 2000 | 21.177643052903 | 1999 | 21.177643052903 | 1998 | 21.177643052903 | 1997 | 21.177643052903 | 1996 | 21.177643052903 | 1995 | 22.008138858899 | 1994 | 22.008138858899 | 1993 | 21.177643052903 | 1992 | 21.011543891703 | 1991 | 21.011543891703 | 1990 | 20.911884394984 | 1989 | 20.886969520804 | 1988 | 20.886969520804 | 1987 | 20.886969520804 | 1986 | 20.886969520804 | 1985 | 20.886969520804 | 1984 | 20.886969520804 | 1983 | 20.886969520804 | 1982 | 20.886969520804 | 1981 | 20.886969520804 | 1980 | 20.886969520804 | 1979 | 20.181048085707 | 1978 | 20.181048085707 | 1977 | 20.181048085707 | 1976 | 20.181048085707 | 1975 | 20.181048085707 | 1974 | 20.181048085707 | 1973 | 20.181048085707 | 1972 | 19.765800182709 | 1971 | 19.765800182709 | 1970 | 19.765800182709 | 1969 | 19.765800182709 | 1968 | 19.765800182709 | 1967 | 19.765800182709 | 1966 | 19.765800182709 | 1965 | 19.765800182709 | 1964 | 19.765800182709 | 1963 | 19.765800182709 | 1962 | 19.765800182709 | 1961 | 19.765800182709 |
|