Year	Percent change (Units)
1995	9.173
1996	-1.932
1997	11.949
1998	9.052
1999	21.359
2000	-9.624
2001	-11.545
2002	-13.077
2003	14.723
2004	13.238
2005	12.305
2006	-4.900
2007	0.669
2008	7.027
2009	9.794
2010	-6.954
2011	6.477
2012	14.415
2013	-5.622
2014	4.033
2015	10.334
2016	1.972
2017	1.349
2018	4.497
2019	1.445
2020	-14.171
2021	14.846
2022	19.733
2023	4.842