Year	Percent change (Units)
1990	21.700
1991	0.763
1992	-23.518
1993	15.260
1994	-1.771
1995	-35.935
1996	-12.044
1997	4.250
1998	-12.123
1999	-3.849
2000	12.679
2001	-2.048
2002	12.671
2003	2.501
2004	-1.284
2005	0.790
2006	34.957
2007	0.265
2008	8.069
2009	10.708
2010	5.853
2011	3.629
2012	22.139
2013	-0.997
2014	11.120
2015	-6.128
2016	-33.124
2017	81.530
2018	10.658
2019	12.956
2020	-31.535
2021	46.432
2022	5.383
2023	1.207
2024	1.303
2025	1.567
2026	4.682
2027	7.656
2028	4.076
2029	1.551