Year | Value | 2021 | 27.688147305114 | 2020 | 25.856714101269 | 2019 | 27.170390540413 | 2018 | 25.136218781144 | 2017 | 25.052459088529 | 2016 | 23.833062761066 | 2015 | 23.128605183941 | 2014 | 25.610887965064 | 2013 | 25.906119881477 | 2012 | 27.403590040386 | 2011 | 28.698981995771 | 2010 | 28.948560598666 | 2009 | 25.977033839909 | 2008 | 29.377402968054 | 2007 | 29.260023566547 | 2006 | 28.848957629126 | 2005 | 27.242539523299 |
|