Year	Percent change (Units)
1996	8.564
1997	-14.004
1998	-15.101
1999	0.992
2000	15.411
2001	-9.985
2002	10.259
2003	4.129
2004	14.293
2005	13.134
2006	2.065
2007	-4.704
2008	19.588
2009	-26.177
2010	6.700
2011	-0.248
2012	19.942
2013	1.194
2014	-8.114
2015	-10.834
2016	-11.409
2017	12.436
2018	10.938
2019	-8.464
2020	-11.667
2021	19.736
2022	-4.261
2023	10.082
2024	2.279
2025	3.476
2026	0.982
2027	0.874
2028	0.730
2029	0.858