Year	Percent change (Units)
2013	2.800
2014	1.300
2015	0.913
2016	0.024
2017	3.957
2018	4.266
2019	4.517
2020	4.304
2021	4.620
2022	6.785
2023	6.104
2024	4.800
2025	3.900
2026	3.600
2027	3.400
2028	3.200
2029	3.000