Year	Percent change (Units)
1993	-7.500
1994	-1.800
1995	-1.100
1996	1.200
1997	1.351
1998	3.381
1999	4.348
2000	4.539
2001	-3.067
2002	1.494
2003	2.223
2004	4.674
2005	4.724
2006	5.137
2007	6.473
2008	5.472
2009	-0.359
2010	3.359
2011	2.340
2012	-0.456
2013	2.925
2014	3.629
2015	3.856
2016	2.848
2017	1.082
2018	2.881
2019	3.910
2020	-4.688
2021	4.511
2022	2.221
2023	1.027
2024	2.700
2025	3.700
2026	3.900
2027	3.900
2028	3.800
2029	3.500