Year % (cumulative) 2006 0 2007 0 2008 0 2009 0 2010 0 2011 0 2012 0 2013 0 2014 12.7886056900024 2015 12.7203960418701 2016 12.2542095184326 2017 15.6628389358521 2018 14.993218421936 2019 14.0159597396851 2020 15.3795900344849 2021 13.892746925354 2022 13.3534097671509