Year	Percent change (Units)
1993	46.893
1994	-15.806
1995	4.919
1996	9.366
1997	-2.689
1998	-12.395
1999	-10.154
2000	16.525
2001	6.999
2002	6.892
2003	14.157
2004	18.198
2005	-8.520
2006	2.651
2007	3.173
2008	2.282
2009	-24.226
2010	9.293
2011	6.162
2012	1.441
2013	-14.653
2014	-10.592
2015	-11.559
2016	-3.383
2017	7.855
2018	1.905
2019	6.425
2020	11.261
2021	35.044
2022	-43.844
2023	-16.071
2024	18.481
2025	2.647
2026	15.780
2027	6.975
2028	9.770
2029	7.832