Year	Percent change (Units)
1980	-2.790
1981	8.391
1982	1.244
1983	4.530
1984	-1.678
1985	5.525
1986	8.607
1987	20.214
1988	-6.943
1989	-7.014
1990	8.855
1991	8.372
1992	5.742
1993	12.844
1994	12.602
1995	10.108
1996	8.588
1997	4.879
1998	-0.389
1999	15.928
2000	12.693
2001	-6.733
2002	0.354
2003	-3.025
2004	9.996
2005	4.202
2006	2.916
2007	26.639
2008	5.024
2009	-15.689
2010	18.325
2011	10.367
2012	-0.084
2013	0.006
2014	3.723
2015	0.139
2016	10.293
2017	1.352
2018	5.221
2019	2.476
2020	-1.076
2021	20.218
2022	6.473
2023	-9.548
2024	-2.000
2025	7.000
2026	4.600
2027	4.600
2028	4.600
2029	4.600