Year	Percent change (Units)
1998	44.411
1999	45.408
2000	111.959
2001	26.258
2002	2.508
2003	4.107
2004	14.202
2005	15.839
2006	5.718
2007	11.025
2008	8.584
2009	6.601
2010	10.245
2011	7.004
2012	12.184
2013	2.195
2014	1.752
2015	1.556
2016	1.532
2017	3.017
2018	1.987
2019	1.846
2020	1.259
2021	7.857
2022	15.122
2023	7.649
2024	3.600
2025	3.000
2026	3.000
2027	3.000
2028	3.000
2029	3.000