Year Percent change (Units) 2013 3.651 2014 5.318 2015 -8.959 2016 -3.779 2017 1.666 2018 3.928 2019 -0.386 2020 -15.345 2021 33.283 2022 1.587 2023 -7.126 2024 11.228 2025 5.758 2026 5.493 2027 5.243 2028 5.048 2029 3.364