Year	Percent change (Units)
1980	9.190
1981	-4.400
1982	0.596
1983	-3.400
1984	5.307
1985	7.901
1986	7.544
1987	3.601
1988	0.264
1989	3.200
1990	-4.168
1991	1.031
1992	-0.467
1993	4.665
1994	5.334
1995	4.417
1996	2.209
1997	3.395
1998	0.338
1999	0.468
2000	4.388
2001	1.390
2002	3.053
2003	1.141
2004	5.760
2005	3.202
2006	3.962
2007	6.070
2008	5.094
2009	-0.126
2010	7.528
2011	3.974
2012	1.921
2013	3.005
2014	0.504
2015	-3.546
2016	-3.276
2017	1.323
2018	1.784
2019	1.221
2020	-3.277
2021	4.763
2022	3.017
2023	2.908
2024	2.154
2025	2.123
2026	2.083
2027	1.998
2028	2.001
2029	1.999