Year	Percent change (Units)
1990	15.000
1991	-44.208
1992	-0.750
1993	-9.790
1994	-8.876
1995	-11.288
1996	-7.207
1997	-0.766
1998	8.713
1999	-2.991
2000	4.414
2001	-7.179
2002	0.722
2003	18.507
2004	6.257
2005	13.755
2006	23.411
2007	17.295
2008	8.477
2009	-22.699
2010	-20.199
2011	29.962
2012	27.095
2013	3.890
2014	-21.761
2015	-7.154
2016	-5.205
2017	52.818
2018	0.102
2019	14.345
2020	-30.878
2021	64.490
2022	-15.598
2023	-1.510
2024	15.853
2025	2.250
2026	4.735
2027	3.915
2028	4.278
2029	1.816