Year	Percent change (Units)
2001	6.030
2002	5.654
2003	5.480
2004	2.532
2005	1.033
2006	6.644
2007	7.668
2008	6.231
2009	0.978
2010	8.022
2011	15.493
2012	9.202
2013	4.034
2014	0.306
2015	-0.610
2016	0.000
2017	0.614
2018	2.136
2019	0.299
2020	1.192
2021	5.299
2022	6.897
2023	8.718
2024	2.500
2025	2.000
2026	2.000
2027	2.000
2028	2.000
2029	2.000