Year	Percent change (Units)
1993	-9.400
1994	9.400
1995	8.100
1996	9.912
1997	60.576
1998	-16.845
1999	-33.379
2000	12.910
2001	14.043
2002	21.274
2003	3.446
2004	7.987
2005	8.393
2006	32.225
2007	36.350
2008	21.250
2009	-36.350
2010	33.000
2011	20.400
2012	4.425
2013	-3.675
2014	-8.000
2015	-25.225
2016	1.450
2017	16.725
2018	2.125
2019	3.025
2020	-3.325
2021	17.125
2022	-15.583
2023	15.999
2024	2.709
2025	1.896
2026	1.758
2027	1.864
2028	2.022
2029	2.254