Year	Percent change (Units)
1993	54.039
1994	-13.774
1995	-15.735
1996	10.500
1997	-3.215
1998	-15.300
1999	-13.300
2000	3.532
2001	12.558
2002	5.892
2003	30.296
2004	13.575
2005	12.799
2006	12.308
2007	20.301
2008	13.492
2009	-41.623
2010	15.014
2011	21.517
2012	1.613
2013	-8.575
2014	-24.991
2015	-28.552
2016	8.279
2017	16.551
2018	8.495
2019	7.191
2020	-3.344
2021	17.040
2022	-24.734
2023	21.058
2024	10.989
2025	9.179
2026	9.339
2027	9.957
2028	4.344
2029	2.962