Year	Percent change (Units)
1993	-8.700
1994	-12.700
1995	-4.100
1996	-3.581
1997	1.376
1998	-5.319
1999	6.347
2000	10.054
2001	5.082
2002	4.746
2003	7.356
2004	7.145
2005	6.397
2006	8.165
2007	8.550
2008	5.247
2009	-7.821
2010	4.512
2011	3.876
2012	4.024
2013	1.755
2014	0.736
2015	-1.973
2016	0.194
2017	1.827
2018	2.806
2019	2.198
2020	-2.654
2021	5.988
2022	-1.201
2023	3.585
2024	3.163
2025	1.811
2026	1.250
2027	1.250
2028	1.250
2029	1.250