Year	Percent change (Units)
1980	-1.387
1981	8.052
1982	0.796
1983	-90.597
1984	-25.583
1985	2.274
1986	-2.717
1987	244.868
1988	110.192
1989	-2.412
1990	-1.356
1991	5.657
1992	5.924
1993	48.140
1994	-1.769
1995	9.419
1996	2.927
1997	19.477
1998	11.214
1999	6.634
2000	-3.642
2001	26.668
2002	5.337
2003	5.264
2004	-12.786
2005	-8.315
2006	-3.171
2007	12.221
2008	-9.401
2009	4.413
2010	-21.264
2011	3.838
2012	24.156
2013	-9.319
2014	12.388
2015	30.124
2016	-9.362
2017	3.864
2018	27.070
2019	6.285
2020	-28.208
2021	9.378
2022	1.400
2023	6.328
2024	-0.169
2025	16.515
2026	3.159
2027	3.219
2028	3.041
2029	2.572