Year	Percent change (Units)
2003	6.530
2004	13.266
2005	10.562
2006	4.285
2007	16.092
2008	18.814
2009	-9.836
2010	10.246
2011	9.312
2012	5.875
2013	7.241
2014	1.487
2015	1.131
2016	4.588
2017	3.041
2018	0.755
2019	2.773
2020	4.987
2021	15.342
2022	1.936