Year	Percent change (Units)
1996	29.291
1997	10.673
1998	7.862
1999	6.618
2000	6.938
2001	18.869
2002	12.883
2003	14.033
2004	15.001
2005	17.856
2006	8.218
2007	5.401
2008	11.581
2009	12.536
2010	13.742
2011	10.825
2012	12.225
2013	8.495
2014	8.048
2015	9.010
2016	15.696
2017	16.502
2018	12.094
2019	11.397
2020	13.247
2021	16.953
2022	18.847
2023	24.660
2024	26.311
2025	22.972
2026	16.017
2027	15.382
2028	14.000
2029	14.000