Year	Percent change (Units)
1992	-21.607
1993	17.435
1994	-24.748
1995	-14.103
1996	17.714
1997	8.652
1998	-25.550
1999	2.569
2000	-9.685
2001	19.961
2002	48.397
2003	14.141
2004	-8.129
2005	14.305
2006	1.207
2007	20.806
2008	11.026
2009	23.057
2010	10.133
2011	-54.750
2012	117.031
2013	28.486
2014	-9.527
2015	-34.831
2016	-41.829
2017	24.219
2018	17.174
2019	37.875
2020	-41.120
2021	54.777
2022	-7.400
2023	0.340
2024	-3.567
2025	-1.945
2026	-0.534
2027	-1.765
2028	-2.171
2029	-2.228