Year	Percent change (Units)
1985	3.240
1986	-7.585
1987	7.200
1988	24.118
1989	-31.737
1990	2.447
1991	25.240
1992	4.752
1993	-11.738
1994	-28.400
1995	31.011
1996	-15.485
1997	62.421
1998	14.298
1999	-11.449
2000	14.985
2001	15.789
2002	-28.215
2003	-23.457
2004	66.582
2005	38.777
2006	40.169
2007	31.575
2008	3.187
2009	-21.528
2010	-6.101
2011	13.803
2012	24.948
2013	-13.643
2014	-21.665
2015	-23.102
2016	-50.061
2017	-34.651
2018	0.300
2019	-22.200
2020	-26.091
2021	-10.485
2022	8.245
2023	12.188
2024	8.448
2025	7.702