Year	Percent change (Units)
1980	-4.947
1981	-1.288
1982	2.645
1983	-9.856
1984	5.223
1985	0.867
1986	6.080
1987	4.801
1988	6.510
1989	-13.920
1990	6.468
1991	9.730
1992	6.060
1993	0.275
1994	-2.349
1995	3.952
1996	-0.198
1997	6.371
1998	0.294
1999	-5.970
2000	3.687
2001	3.394
2002	-8.856
2003	-7.755
2004	18.287
2005	10.318
2006	9.872
2007	8.754
2008	5.278
2009	-3.202
2010	-1.489
2011	4.176
2012	5.626
2013	1.343
2014	-3.894
2015	-6.221
2016	-17.040
2017	-15.671
2018	-19.655
2019	-27.670
2020	-29.995
2021	1.000
2022	8.000
2023	4.000
2024	4.000
2025	3.000