Year % 2010 17.3647301705058 2011 16.1884799470155 2012 10.7283277755773 2013 11.2867043457682 2014 11.898840844669 2015 10.8790170382158 2016 8.87767264717397 2017 10.5408152245424 2018 11.5432812447972 2019 12.8102391076967 2020 10.1107983076337