Year	Percent change (Units)
1982	4.989
1983	-1.735
1984	-2.493
1985	-3.005
1986	18.615
1987	-17.841
1988	11.502
1989	-8.939
1990	-8.283
1991	33.417
1992	1.339
1993	4.145
1994	0.338
1995	24.168
1996	-8.719
1997	3.889
1998	1.657
1999	-4.689
2000	-5.051
2001	12.395
2002	-1.810
2003	1.635
2004	-11.692
2005	-13.682
2006	1.431
2007	-8.092
2008	0.036
2009	10.021
2010	-11.003
2011	5.745
2012	2.765
2013	-6.937
2014	2.357
2015	9.828
2016	-7.187
2017	-7.884
2018	-9.673
2019	24.023
2020	29.397
2021	-1.894
2022	-7.544
2023	-3.399
2024	3.267
2025	10.491
2026	7.618
2027	3.552
2028	5.619
2029	5.024