Year	Percent change (Units)
1996	8.577
1997	-1.808
1998	-11.521
1999	19.497
2000	23.955
2001	-4.589
2002	-1.136
2003	4.705
2004	-0.775
2005	17.887
2006	8.850
2007	3.173
2008	8.035
2009	-18.343
2010	2.572
2011	21.656
2012	12.829
2013	1.503
2014	-6.370
2015	-13.262
2016	-18.909
2017	12.042
2018	7.681
2019	2.150
2020	-11.423
2021	47.555
2022	-10.189
2023	3.504
2024	5.629
2025	2.101
2026	-2.390
2027	-2.199
2028	-1.606
2029	-0.268