Year | Value | 2021 | 22.178893178893 | 2020 | 22.233314947601 | 2019 | 22.287736716308 | 2018 | 22.342158485016 | 2017 | 22.396580253723 | 2016 | 22.451002022431 | 2015 | 22.505423791138 | 2014 | 22.559845559846 | 2013 | 22.614267328553 | 2012 | 22.668689097261 | 2011 | 22.723110865968 | 2010 | 22.777532634675 | 2009 | 22.831943371943 | 2008 | 22.886354109211 | 2007 | 22.940764846479 | 2006 | 22.995175583747 | 2005 | 23.049586321015 | 2004 | 23.103997058283 | 2003 | 23.158407795551 | 2002 | 23.212818532818 | 2001 | 23.267229270086 | 2000 | 23.321640007354 | 1999 | 23.492987681559 | 1998 | 23.664335355764 | 1997 | 23.835683029969 | 1996 | 24.007030704174 | 1995 | 24.178378378378 | 1994 | 24.349726052583 | 1993 | 24.521073726788 | 1992 | 24.692421400993 | 1991 | 24.863769075198 | 1990 | 25.035116749403 |
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