Year	Percent change (Units)
1993	534.180
1994	1568.333
1995	304.597
1996	53.961
1997	70.857
1998	28.981
1999	29.103
2000	25.006
2001	27.251
2002	27.291
2003	12.494
2004	7.325
2005	10.703
2006	13.109
2007	11.154
2008	13.128
2009	12.298
2010	12.304
2011	12.447
2012	11.900
2013	11.700
2014	9.079
2015	8.464
2016	8.824
2017	13.876
2018	17.524
2019	14.526
2020	12.868
2021	10.849
2022	11.447
2023	9.951
2024	11.579
2025	9.691
2026	7.671
2027	5.923
2028	5.039
2029	5.004