Year	Percent change (Units)
1980	-6.000
1981	-10.000
1982	-4.846
1983	5.600
1984	-0.366
1985	3.862
1986	3.494
1987	2.302
1988	3.285
1989	3.812
1990	-7.171
1991	-7.005
1992	2.033
1993	4.287
1994	5.239
1995	6.728
1996	6.239
1997	7.086
1998	4.982
1999	4.524
2000	4.260
2001	1.205
2002	1.443
2003	3.498
2004	4.983
2005	3.507
2006	6.131
2007	7.062
2008	4.200
2009	2.832
2010	2.935
2011	5.042
2012	1.545
2013	0.857
2014	3.837
2015	4.383
2016	2.954
2017	5.140
2018	5.945
2019	4.450
2020	-2.020
2021	6.935
2022	5.260
2023	0.160
2024	3.068
2025	3.476
2026	3.296
2027	2.996
2028	2.969
2029	3.011