Year Percent change (Units) 2010 0.398 2011 2.120 2012 2.635 2013 2.490 2014 2.798 2015 3.735 2016 1.495 2017 0.591 2018 -0.697 2019 -0.411 2020 -3.374 2021 6.473 2022 5.933 2023 1.645 2024 2.580 2025 2.382 2026 2.223 2027 2.044 2028 2.018 2029 1.964