Year	Percent change (Units)
1980	-6.986
1981	-0.852
1982	4.469
1983	3.430
1984	5.649
1985	8.526
1986	8.165
1987	-2.802
1988	5.577
1989	4.424
1990	3.391
1991	5.121
1992	-0.218
1993	-3.268
1994	14.802
1995	9.177
1996	2.737
1997	10.885
1998	7.158
1999	2.096
2000	12.089
2001	1.696
2002	5.063
2003	-1.557
2004	8.131
2005	10.519
2006	13.075
2007	4.150
2008	0.602
2009	-16.156
2010	4.086
2011	6.081
2012	0.963
2013	3.360
2014	3.814
2015	5.612
2016	0.759
2017	6.128
2018	3.320
2019	1.456
2020	0.716
2021	10.692
2022	1.176
2023	3.236
2024	8.160
2025	1.940
2026	1.940
2027	1.940
2028	1.940
2029	1.940