Year	Percent change (Units)
1996	23.166
1997	24.966
1998	6.140
1999	-12.351
2000	4.976
2001	17.576
2002	18.582
2003	8.856
2004	15.211
2005	16.831
2006	14.302
2007	10.649
2008	10.819
2009	-28.654
2010	16.811
2011	14.217
2012	5.170
2013	5.812
2014	-1.672
2015	9.353
2016	4.041
2017	11.141
2018	6.025
2019	6.005
2020	-4.350
2021	19.934
2022	12.420
2023	-6.626
2024	4.731
2025	4.885
2026	5.173
2027	5.182
2028	5.212
2029	5.064