Year	Percent change (Units)
2003	36.217
2004	-0.428
2005	55.011
2006	-2.201
2007	-10.212
2008	-8.264
2009	31.051
2010	31.905
2011	12.404
2012	31.699
2013	3.402
2014	-14.247
2015	16.626
2016	-8.390
2017	3.879
2018	-4.972
2019	-7.077
2020	-3.564