Year	Percent change (Units)
2000	-13.980
2001	-26.381
2002	18.452
2003	10.575
2004	-3.609
2005	-4.020
2006	-11.703
2007	-11.216
2008	13.410
2009	-10.611
2010	-3.266
2011	42.605
2012	-1.639
2013	10.377
2014	-2.118
2015	-5.387
2016	20.897
2017	-5.372
2018	1.559
2019	-5.672
2020	-4.286