Year	Percent change (Units)
1998	16.582
1999	14.055
2000	14.363
2001	19.583
2002	-12.167
2003	31.908
2004	8.985
2005	-9.865
2006	-17.639
2007	26.361
2008	52.353
2009	59.305
2010	-6.344
2011	23.191
2012	17.501
2013	16.935
2014	1.647
2015	-13.191
2016	-5.876
2017	-22.058
2018	-48.213
2019	11.572
2020	7.363
2021	-6.331
2022	1.297
2023	10.137
2024	2.052
2025	4.218
2026	6.987
2027	7.876
2028	7.727
2029	9.590