Year	Percent change (Units)
1993	-2.100
1994	4.900
1995	7.666
1996	2.022
1997	-0.969
1998	4.778
1999	-8.827
2000	7.274
2001	3.716
2002	9.372
2003	12.400
2004	10.500
2005	4.700
2006	4.900
2007	4.675
2008	0.850
2009	-2.525
2010	8.925
2011	-4.450
2012	-0.750
2013	4.150
2014	-0.150
2015	6.350
2016	2.550
2017	3.050
2018	4.200
2019	-3.000
2020	-1.500
2021	-1.750
2022	-7.785
2023	-14.767
2024	6.021
2025	5.564
2026	4.249
2027	3.659
2028	2.980
2029	3.151