Year % (cumulative) 1991 19.556489944458 1994 19.0592803955078 1995 19.9088096618652 2003 34.8693695068359 2004 36.0526313781738 2006 30.959659576416 2007 33.4000015258789 2008 36.5706596374512 2009 34.4418106079102 2010 32.6388893127441 2011 33.4295616149902 2012 36.0119018554688 2013 36.8828086853027 2014 29.3604698181152 2015 38.6467895507812 2016 38.9722900390625 2017 37.0138664245605 2018 41.9003982543945 2019 38.8688201904297 2020 42.0964088439941 2021 40.6760787963867 2022 41.8732643127441