Year	Percent change (Units)
1990	-11.032
1991	28.800
1992	6.366
1993	10.657
1994	-3.386
1995	9.529
1996	2.800
1997	-2.724
1998	-0.700
1999	4.431
2000	-0.868
2001	-4.475
2002	-2.331
2003	6.325
2004	27.400
2005	-1.197
2006	17.564
2007	1.908
2008	9.184
2009	-4.494
2010	5.563
2011	-6.899
2012	2.284
2013	-6.829
2014	0.636
2015	-11.289
2016	9.511
2017	17.069
2018	11.934
2019	-7.381
2020	-17.572
2021	14.778
2022	19.927
2023	3.742
2024	8.958
2025	5.150
2026	0.798
2027	3.693
2028	2.183
2029	2.840