Year	Percent change (Units)
1993	2.800
1994	5.300
1995	4.100
1996	3.203
1997	5.050
1998	3.280
1999	5.332
2000	3.673
2001	3.217
2002	3.506
2003	2.960
2004	4.359
2005	3.798
2006	5.746
2007	6.980
2008	3.510
2009	-7.549
2010	1.344
2011	0.861
2012	-2.640
2013	-1.029
2014	2.768
2015	2.210
2016	3.192
2017	4.816
2018	4.455
2019	3.523
2020	-4.241
2021	8.229
2022	2.461
2023	1.587
2024	2.010
2025	2.500
2026	2.700
2027	2.700
2028	2.700
2029	2.700