Year	Percent change (Units)
1996	2.085
1997	7.592
1998	9.652
1999	5.197
2000	14.781
2001	9.429
2002	0.922
2003	8.823
2004	29.679
2005	18.158
2006	14.289
2007	11.031
2008	4.214
2009	-9.828
2010	14.662
2011	9.164
2012	4.279
2013	0.260
2014	8.714
2015	6.032
2016	4.343
2017	7.198
2018	3.707
2019	1.479
2020	-8.031
2021	6.895
2022	7.227
2023	2.848
2024	1.420
2025	3.889
2026	4.150
2027	4.550
2028	4.633
2029	4.800