Year	Percent change (Units)
1998	21.748
1999	4.605
2000	27.148
2001	10.817
2002	25.455
2003	33.373
2004	25.401
2005	24.822
2006	25.983
2007	19.733
2008	9.386
2009	-10.801
2010	29.045
2011	11.164
2012	6.790
2013	9.583
2014	4.306
2015	-2.281
2016	1.293
2017	8.604
2018	4.014
2019	-0.277
2020	4.781
2021	16.220
2022	-3.210
2023	3.210
2024	2.376
2025	1.796
2026	2.846
2027	2.843
2028	2.840
2029	2.837