Year	Percent change (Units)
1999	8.123
2000	3.204
2001	19.313
2002	11.095
2003	5.037
2004	7.524
2005	7.000
2006	11.911
2007	11.659
2008	9.388
2009	9.708
2010	6.618
2011	11.449
2012	7.709
2013	8.494
2014	7.661
2015	8.039
2016	12.518
2017	13.894
2018	28.525
2019	20.251
2020	13.122
2021	5.459
2022	9.185
2023	10.015
2024	5.431
2025	5.566
2026	5.006
2027	4.910
2028	4.852
2029	4.816