Year % 2013 6.75144668429113 2014 7.38229064271826 2015 6.98316925510985 2016 6.29532787457238 2017 5.81607008497907 2018 5.84082282899512 2019 5.94288777932888 2020 5.79145205010607 2021 5.13999075401632 2022 4.94090382626975