Year	Percent change (Units)
1983	3.947
1984	5.316
1985	12.500
1986	27.350
1987	2.517
1988	13.584
1989	4.035
1990	6.925
1991	13.831
1992	8.418
1993	-2.698
1994	7.580
1995	-0.032
1996	3.122
1997	1.979
1998	3.229
1999	4.436
2000	5.995
2001	6.638
2002	10.706
2003	12.250
2004	10.084
2005	8.651
2006	6.401
2007	5.675
2008	12.195
2009	1.228
2010	2.731
2011	7.084
2012	2.301
2013	0.187
2014	1.497
2015	0.184
2016	0.214
2017	9.792
2018	6.689
2019	-0.122
2020	-1.403
2021	6.911
2022	11.312
2023	7.344
2024	5.842
2025	3.279
2026	3.236
2027	3.310
2028	3.274
2029	3.262