Year	Percent change (Units)
1999	15.989
2000	19.845
2001	26.221
2002	16.544
2003	-0.739
2004	-2.908
2005	8.145
2006	28.500
2007	24.699
2008	3.850
2009	10.122
2010	-5.231
2011	7.603
2012	4.669
2013	21.958
2014	18.431
2015	18.055
2016	-9.748
2017	2.096
2018	18.187
2019	-3.608
2020	-3.700
2021	-20.208
2022	-7.299
2023	-16.798
2024	-2.441
2025	2.017
2026	-2.638
2027	-2.918
2028	5.899
2029	6.681