Year	Percent change (Units)
1993	840.056
1994	214.768
1995	131.326
1996	21.812
1997	11.032
1998	84.436
1999	36.558
2000	20.200
2001	18.584
2002	15.056
2003	11.988
2004	11.741
2005	10.915
2006	8.996
2007	11.869
2008	13.282
2009	8.797
2010	8.777
2011	6.101
2012	6.576
2013	6.450
2014	11.362
2015	12.908
2016	5.375
2017	2.523
2018	4.269
2019	3.046
2020	4.912
2021	8.393
2022	11.923
2023	7.417
2024	5.301
2025	4.370
2026	4.000
2027	4.000
2028	4.000
2029	4.000