Year	Percent change (Units)
1990	5.400
1991	0.763
1992	-7.846
1993	6.475
1994	-5.968
1995	-9.890
1996	-5.274
1997	-0.428
1998	4.293
1999	-5.843
2000	-5.386
2001	8.252
2002	5.219
2003	10.407
2004	-4.052
2005	11.268
2006	4.828
2007	-2.051
2008	4.807
2009	6.565
2010	1.368
2011	-5.103
2012	4.590
2013	3.642
2014	10.084
2015	-2.853
2016	-23.563
2017	52.549
2018	9.327
2019	12.350
2020	-29.504
2021	37.324
2022	4.438
2023	1.155
2024	-1.166
2025	1.266
2026	3.777
2027	6.208
2028	3.225
2029	1.079