Year	Percent change (Units)
1999	-1.111
2000	-4.231
2001	-0.454
2002	-7.704
2003	-16.224
2004	-6.270
2005	-7.413
2006	-3.556
2007	-3.401
2008	-16.323
2009	7.396
2010	19.683
2011	14.197
2012	16.658
2013	1.975
2014	2.394
2015	1.794
2016	0.756
2017	5.176
2018	4.987
2019	-6.307
2020	-7.782
2021	8.425
2022	6.485
2023	5.313
2024	3.196
2025	3.219
2026	3.141
2027	3.062
2028	3.021
2029	3.003