Year	Percent change (Units)
1980	5.999
1981	1.899
1982	-9.391
1983	-5.853
1984	-1.458
1985	0.298
1986	7.500
1987	5.910
1988	0.496
1989	1.104
1990	0.297
1991	3.539
1992	7.932
1993	2.658
1994	7.281
1995	-1.448
1996	5.578
1997	5.496
1998	4.519
1999	-1.939
2000	-1.930
2001	-3.844
2002	-7.732
2003	0.805
2004	5.004
2005	7.460
2006	4.099
2007	6.542
2008	7.176
2009	4.243
2010	7.803
2011	5.162
2012	3.538
2013	4.638
2014	3.239
2015	0.371
2016	1.690
2017	1.740
2018	0.164
2019	0.929
2020	-7.380
2021	5.562
2022	4.707
2023	0.367
2024	3.700
2025	2.899
2026	2.602
2027	2.400
2028	2.300
2029	2.200