Year	Percent change (Units)
1980	6.002
1981	10.344
1982	0.826
1983	1.144
1984	0.912
1985	0.687
1986	-1.377
1987	1.526
1988	1.406
1989	3.311
1990	3.819
1991	2.875
1992	1.790
1993	2.554
1994	2.875
1995	0.842
1996	2.000
1997	2.048
1998	-1.429
1999	0.677
2000	2.063
2001	-0.588
2002	0.436
2003	0.745
2004	1.311
2005	1.260
2006	0.809
2007	3.820
2008	5.366
2009	-0.527
2010	4.590
2011	5.534
2012	4.324
2013	1.499
2014	-0.076
2015	-0.639
2016	0.163
2017	0.375
2018	0.465
2019	0.761
2020	0.024
2021	3.951
2022	6.460
2023	3.739
2024	2.900
2025	2.500
2026	1.978
2027	1.984
2028	1.984
2029	1.964