Year	Percent change (Units)
1993	874.255
1994	307.547
1995	197.300
1996	47.752
1997	14.761
1998	27.686
1999	85.746
2000	20.799
2001	21.477
2002	15.789
2003	13.663
2004	10.889
2005	12.685
2006	9.669
2007	9.007
2008	14.111
2009	11.647
2010	6.849
2011	8.440
2012	5.075
2013	6.754
2014	7.823
2015	15.534
2016	7.042
2017	3.683
2018	2.878
2019	4.470
2020	3.382
2021	6.694
2022	13.750
2023	5.859
2024	6.870
2025	4.548
2026	4.000
2027	4.000
2028	4.000
2029	4.000