Year	Percent change (Units)
1980	11.728
1981	3.623
1982	-2.291
1983	3.209
1984	-2.284
1985	4.007
1986	15.737
1987	3.504
1988	5.030
1989	10.868
1990	9.037
1991	6.760
1992	1.731
1993	0.170
1994	0.727
1995	10.335
1996	12.444
1997	3.315
1998	20.431
1999	4.612
2000	15.957
2001	-0.324
2002	0.917
2003	10.194
2004	2.810
2005	0.167
2006	14.021
2007	16.459
2008	-1.008
2009	-21.361
2010	-5.992
2011	-9.434
2012	-4.356
2013	-1.741
2014	6.912
2015	4.242
2016	5.739
2017	5.672
2018	7.078
2019	0.060
2020	3.036
2021	5.010
2022	3.363
2023	-2.463
2024	2.498
2025	3.273
2026	2.653
2027	2.564
2028	2.306
2029	1.905