Year	Percent change (Units)
1996	-0.750
1997	3.200
1998	-2.114
1999	3.293
2000	5.836
2001	3.960
2002	0.806
2003	2.677
2004	-2.167
2005	1.092
2006	3.117
2007	6.153
2008	4.052
2009	-1.420
2010	3.032
2011	2.784
2012	4.755
2013	1.376
2014	-0.588
2015	-0.318
2016	-0.292
2017	2.435
2018	0.840
2019	0.434
2020	2.250
2021	4.868
2022	18.747
2023	3.623
2024	4.000
2025	2.000
2026	2.000
2027	2.000
2028	2.000
2029	2.000