Year	Percent change (Units)
1980	-3.392
1981	3.859
1982	8.205
1983	4.899
1984	-3.000
1985	-3.000
1986	0.946
1987	4.000
1988	8.294
1989	6.403
1990	6.497
1991	1.778
1992	5.850
1993	6.686
1994	7.694
1995	9.174
1996	6.595
1997	4.620
1998	6.074
1999	7.953
2000	3.941
2001	8.765
2002	7.057
2003	6.159
2004	5.803
2005	10.007
2006	7.049
2007	8.064
2008	10.428
2009	8.069
2010	7.484
2011	7.677
2012	2.333
2013	3.938
2014	5.745
2015	8.005
2016	0.167
2017	6.795
2018	5.568
2019	7.624
2020	-1.142
2021	5.486
2022	6.300
2023	4.766
2024	5.631
2025	6.542
2026	6.693
2027	7.049
2028	6.934
2029	6.991