Year	Percent change (Units)
1999	31.156
2000	37.752
2001	36.481
2002	23.332
2003	3.084
2004	-1.753
2005	9.017
2006	30.567
2007	25.176
2008	3.813
2009	10.389
2010	-4.771
2011	4.202
2012	0.256
2013	10.120
2014	13.408
2015	14.653
2016	-14.118
2017	3.750
2018	18.126
2019	-6.785
2020	-3.825
2021	-8.745
2022	-9.052
2023	-18.919
2024	-5.078
2025	0.018
2026	-6.774
2027	-7.808
2028	4.711
2029	5.863