Year % 2001 17.276559313872205 2002 19.3161777616612 2003 19.94620810519138 2004 20.24120959562029 2005 20.129052610586747 2006 18.465634828898676 2007 19.40435299032109 2008 18.50207045096611 2009 20.819617346714278 2010 24.580744695086896 2011 22.96509897893315 2012 22.59758667667203 2013 22.210786634580934 2014 23.953605471417063 2015 24.81996949234773 2016 25.95271462962944 2017 24.367854664682334 2018 22.26455324083708 2019 22.427571008814475 2020 23.635558021675287 2021 23.33474184171953 2022 23.76554216891106 2023 22.001557737456597