Year	Percent change (Units)
1999	0.200
2000	-7.046
2001	5.327
2002	1.997
2003	-11.316
2004	-12.204
2005	-10.272
2006	21.171
2007	66.899
2008	39.830
2009	12.202
2010	-51.003
2011	92.078
2012	1.087
2013	18.457
2014	48.057
2015	10.712
2016	2.271
2017	19.600
2018	0.396
2019	-14.520
2020	8.370
2021	-25.818
2022	1.608
2023	-2.199
2024	-0.285
2025	3.012
2026	-3.962
2027	-1.084
2028	-0.645
2029	-0.237