Year % 2006 5.34245735688259 2007 4.87864305198447 2008 4.99056742440643 2009 7.91941760061947 2010 11.5855332193819 2011 12.9289612960361 2012 14.5622704712966 2013 16.7568120904944 2014 18.4279034590926 2015 18.1676735966228 2016 15.0408591292297 2017 12.1373945444085 2018 10.4132460170911 2019 7.41124434409121 2020 7.62864949414571 2021 5.69923091645787 2022 4.33106920944263