Year | Value | 2021 | 22.707979244532 | 2020 | 22.783987233402 | 2019 | 22.848995247813 | 2018 | 22.914595408909 | 2017 | 22.982278760244 | 2016 | 23.07176687987 | 2015 | 23.117710415212 | 2014 | 23.212696234282 | 2013 | 23.303336220769 | 2012 | 23.394906478203 | 2011 | 23.486442349564 | 2010 | 23.5780447977 | 2009 | 23.642763062286 | 2008 | 23.707941328083 | 2007 | 23.77254509148 | 2006 | 23.837506611973 | 2005 | 23.902442175325 | 2004 | 23.967208678217 | 2003 | 24.123804753127 | 2002 | 24.188699775575 | 2001 | 24.25375035556 | 2000 | 24.318761365487 | 1999 | 24.493099667384 | 1998 | 24.610982995286 | 1997 | 24.707613896256 | 1996 | 24.825395913118 | 1995 | 24.943177923944 | 1994 | 25.060959940806 | 1993 | 25.173482971346 | 1992 | 25.248809769699 | 1991 | 25.960387805245 | 1990 | 26.081537448065 |
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