Year % 2013 10.1903924477324 2014 10.9148431811181 2015 10.5554512684768 2016 10.9826048365447 2017 11.8624326173721 2018 8.67771279722118 2019 9.57935355188732 2020 8.88153313972677 2021 11.3530933851907