Year	Percent change (Units)
1980	12.500
1981	0.000
1982	0.000
1983	0.000
1984	0.000
1985	0.000
1990	4.750
1991	-8.039
1992	-0.719
1993	-12.255
1994	25.575
1995	32.121
1996	2.294
1997	1.121
1998	-3.104
1999	-7.094
2000	6.650
2001	9.168
2002	-1.096
2003	1.519
2004	6.428
2005	17.891
2006	12.415
2007	17.480
2008	1.546
2009	18.472
2010	-1.683
2011	10.061
2012	-0.159
2013	4.319
2014	0.256
2015	-2.651
2016	-6.273
2017	9.945
2018	-10.452
2019	6.506
2020	1.745
2021	13.000
2022	-2.405
2023	-11.461
2024	7.932
2025	5.729
2026	7.793
2027	7.075
2028	7.026
2029	5.932