Year	Percent change (Units)
1993	-27.123
1994	-18.970
1995	-17.364
1996	6.701
1997	21.056
1998	-8.735
1999	-10.412
2000	10.522
2001	-3.239
2002	7.316
2003	21.156
2004	19.970
2005	-3.907
2006	20.934
2007	31.318
2008	17.652
2009	-7.956
2010	-11.447
2011	12.835
2012	22.963
2013	12.546
2014	-22.633
2015	-6.980
2016	-1.722
2017	1.282
2018	-1.094
2019	15.187
2020	-24.707
2021	11.851
2022	-1.174
2023	96.792
2024	42.777
2025	7.389
2026	5.522
2027	1.539
2028	0.072
2029	1.946