Year % 2012 7.06078410566687 2013 8.38265228013626 2014 9.11141269872146 2015 8.52432101821958 2016 8.44034922621483 2017 8.76612972477976 2018 8.91952686381326 2019 8.91081304800064 2020 9.19113083750988 2021 8.62583670401558 2022 8.93137213624951