Year | Value | 2021 | 25.275257108288 | 2020 | 25.219611354452 | 2019 | 25.358724320662 | 2018 | 25.381711713892 | 2017 | 25.338123926351 | 2016 | 24.180476593686 | 2015 | 23.440959074798 | 2014 | 23.305469194198 | 2013 | 23.292079507374 | 2012 | 22.947567083646 | 2011 | 22.813278811488 | 2010 | 22.794473480449 | 2009 | 22.68161022488 | 2008 | 22.513222070268 | 2007 | 22.437642958283 | 2006 | 22.281786608904 | 2005 | 22.298572465521 | 2004 | 22.265095800271 | 2003 | 22.243865847166 | 2002 | 22.238495243167 | 2001 | 22.222894775071 | 2000 | 22.10035712124 | 1999 | 22.065171392298 | 1998 | 21.779473354836 | 1997 | 21.644615883774 | 1996 | 21.447540766911 | 1995 | 20.744559404929 | 1994 | 20.712114111299 | 1993 | 20.618383263035 | 1992 | 20.482593700806 |
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