Year	Percent change (Units)
1996	8.736
1997	10.085
1998	6.832
1999	2.326
2000	3.977
2001	4.098
2002	0.656
2003	1.043
2004	2.710
2005	2.261
2006	1.720
2007	5.435
2008	3.666
2009	0.994
2010	2.298
2011	2.353
2012	2.403
2013	1.429
2014	0.101
2015	0.000
2016	2.010
2017	2.365
2018	2.021
2019	3.208
2020	2.285
2021	6.613
2022	15.759
2023	6.879
2024	2.150
2025	2.000
2026	2.000
2027	2.000
2028	2.000
2029	2.000