Year % (cumulative) 2006 0 2007 0 2008 0 2009 0 2010 0 2011 0 2012 0 2013 0 2014 12.6555461883545 2015 12.641884803772 2016 13.2569046020508 2017 18.2718505859375 2018 20.7772903442383 2019 18.4420299530029 2020 18.4630603790283 2021 17.0766830444336 2022 18.6816329956055