Year	Percent change (Units)
2001	3.589
2002	4.087
2003	8.017
2004	2.210
2005	1.612
2006	5.232
2007	8.639
2008	7.427
2009	-0.209
2010	5.178
2011	13.174
2012	10.935
2013	9.451
2014	0.849
2015	0.646
2016	-1.470
2017	0.523
2018	2.294
2019	0.892
2020	0.488
2021	3.775
2022	7.005
2023	8.420
2024	3.508
2025	2.200
2026	2.000
2027	2.000
2028	2.000
2029	2.000