Year	Percent change (Units)
1980	-3.171
1981	2.554
1982	-15.829
1983	10.107
1984	17.468
1985	8.334
1986	6.717
1987	5.389
1988	13.477
1989	5.818
1990	1.802
1991	2.565
1992	5.230
1993	7.494
1994	8.341
1995	5.790
1996	5.384
1997	14.450
1998	5.294
1999	8.065
2000	8.542
2001	-4.906
2002	1.913
2003	4.218
2004	8.521
2005	7.340
2006	5.316
2007	5.784
2008	0.913
2009	-12.412
2010	13.784
2011	5.592
2012	3.678
2013	2.081
2014	2.517
2015	0.760
2016	0.052
2017	4.781
2018	3.508
2019	-0.121
2020	-9.395
2021	8.118
2022	7.649
2023	1.011
2024	1.634
2025	3.718
2026	3.959
2027	4.256
2028	4.224
2029	4.182