Year	Percent change (Units)
1980	-37.576
1981	99.547
1982	8.200
1983	46.821
1984	18.178
1985	22.441
1986	9.327
1987	-9.345
1988	-3.394
1989	-9.783
1990	38.922
1991	22.005
1992	-6.308
1993	-13.253
1994	-50.450
1995	0.000
1996	-11.592
1997	21.023
1998	16.323
1999	1.353
2000	2.864
2001	119.789
2002	199.898
2003	-51.137
2004	8.906
2005	30.878
2006	33.273
2007	-2.433
2008	30.565
2009	11.012
2010	2.606
2011	8.247
2012	3.875
2013	-8.552
2014	-2.356
2015	-17.956
2016	11.838
2017	27.997
2018	17.102
2019	-3.832
2020	-6.320
2021	9.096
2022	-13.435
2023	28.743
2024	-5.146
2025	1.596
2026	2.498
2027	-3.054
2028	0.857
2029	0.680