Year	Percent change (Units)
1998	9.412
1999	14.201
2000	25.942
2001	14.459
2002	22.246
2003	32.446
2004	20.377
2005	13.385
2006	17.693
2007	14.901
2008	7.545
2009	3.117
2010	23.094
2011	13.422
2012	6.591
2013	10.647
2014	7.774
2015	-0.438
2016	4.387
2017	6.227
2018	7.341
2019	-1.740
2020	-6.685
2021	10.452
2022	-2.639
2023	3.001
2024	4.429
2025	1.588
2026	3.900
2027	3.700
2028	3.600
2029	3.500