Year	Percent change (Units)
1992	-82.872
1993	115.046
1994	-17.381
1995	24.539
1996	32.435
1997	-20.473
1998	-20.295
1999	-4.712
2000	-23.059
2001	32.500
2002	-16.993
2003	0.431
2004	13.292
2005	-0.781
2006	9.462
2007	38.382
2008	24.588
2009	15.812
2010	-5.717
2011	11.317
2012	9.802
2013	5.092
2014	1.727
2015	8.271
2016	0.035
2017	2.421
2018	40.346
2019	15.848
2020	-8.651
2021	-2.475
2022	8.262
2023	32.988
2024	10.775
2025	9.788
2026	9.702
2027	8.705
2028	8.175
2029	7.556