Year	Percent change (Units)
1980	9.657
1981	19.719
1982	22.937
1983	10.090
1984	-6.409
1986	5.575
1987	-9.705
1988	-18.206
1989	-4.637
1990	4.453
1991	-0.245
1992	-8.784
1993	-5.915
1994	2.885
1995	-2.346
1996	10.215
1997	16.728
1998	9.300
1999	-0.200
2000	6.694
2001	12.368
2002	0.690
2003	-1.377
2004	3.690
2005	5.780
2006	3.317
2007	18.242
2008	11.525
2009	-12.502
2010	-3.021
2011	9.142
2012	4.507
2013	8.426
2014	10.312
2015	2.895
2016	-0.746
2017	1.186
2018	2.055
2019	22.782
2020	-15.623
2021	14.881
2022	-11.784
2023	13.326
2024	5.686
2025	6.359
2026	5.568
2027	4.451
2028	5.142
2029	6.030