Year % 2013 16.2015669481166 2014 15.9901521817941 2015 13.773762892753 2016 13.5239667915277 2017 15.3767768819838 2018 19.9656221631193 2019 23.6060674782463 2020 22.3410510306587 2021 21.4230858508675 2022 21.7461154561416 2023 22.150086026479