Year	Percent change (Units)
1998	2.536
1999	1.426
2000	1.624
2001	-2.578
2002	23.562
2003	-1.578
2004	13.226
2005	30.262
2006	9.970
2007	22.120
2008	10.307
2009	-3.610
2010	-3.425
2011	-4.837
2012	3.829
2013	-0.752
2014	-2.985
2015	5.750
2016	-0.816
2017	-1.509
2018	-9.585
2019	-5.705
2020	-6.428
2021	-8.521
2022	3.388
2023	-6.320
2024	2.972
2025	5.707
2026	5.811
2027	1.992
2028	2.195
2029	2.581