Year	Percent change (Units)
1993	-10.000
1994	-17.300
1995	-7.200
1996	-6.700
1997	-11.300
1998	6.700
1999	16.499
2000	18.587
2001	20.391
2002	15.768
2003	17.095
2004	14.692
2005	13.040
2006	10.967
2007	11.057
2008	14.747
2009	6.133
2010	16.026
2011	12.660
2012	7.209
2013	-1.754
2014	3.605
2015	2.159
2016	-0.466
2017	2.141
2018	1.740
2019	-3.666
2020	-2.116
2021	-0.338
2022	5.315
2023	1.954
2024	2.293
2025	2.262
2026	2.272
2027	2.257
2028	2.246
2029	2.246