Year	Percent change (Units)
1993	2600.715
1994	350.358
1995	612.481
1996	418.472
1997	87.956
1998	43.175
1999	27.452
2000	32.851
2001	38.592
2002	12.227
2003	16.356
2004	7.206
2005	7.277
2006	9.969
2007	13.168
2008	20.429
2009	6.419
2010	6.463
2011	12.422
2012	5.796
2013	5.035
2014	6.077
2015	5.781
2016	5.914
2017	7.310
2018	3.843
2019	7.790
2020	8.580
2021	8.974
2022	6.641
2023	3.652
2024	4.915
2025	6.250
2026	6.500
2027	6.500
2028	6.500
2029	6.500