Year	Percent change (Units)
1999	1.982
2000	5.300
2001	12.149
2002	14.160
2003	10.330
2004	3.555
2005	6.945
2006	9.514
2007	11.391
2008	17.490
2009	7.427
2010	7.291
2011	8.487
2012	6.832
2013	7.578
2014	9.858
2015	7.742
2016	8.844
2017	12.435
2018	23.547
2019	26.969
2020	16.953
2021	7.816
2022	7.593
2023	10.094
2024	6.344
2025	5.111
2026	5.070
2027	4.949
2028	4.876
2029	4.831