Year	Percent change (Units)
1993	12.882
1994	20.918
1995	2.325
1996	9.136
1997	7.900
1998	1.966
1999	0.187
2000	-12.355
2001	8.755
2002	3.005
2003	-2.656
2004	1.452
2005	2.574
2006	-0.969
2007	1.427
2008	-19.436
2009	12.179
2010	10.853
2011	25.710
2012	1.886
2013	-10.456
2014	30.934
2015	-20.621
2016	7.391
2017	-10.015
2018	13.032
2019	3.836