Year	Percent change (Units)
1980	-23.242
1981	4.671
1982	2.678
1983	-2.000
1984	0.400
1986	26.724
1987	14.140
1988	-2.829
1989	-42.341
1990	86.373
1991	7.706
1992	46.589
1993	-9.493
1994	-46.044
1995	112.650
1996	4.947
1997	3.930
1998	8.591
1999	21.751
2000	-9.864
2001	6.162
2002	24.462
2003	27.612
2004	-0.094
2005	-11.872
2006	10.935
2007	42.846
2008	1.120
2009	9.255
2010	-13.614
2011	-12.222
2012	6.875
2013	34.868
2014	26.816
2015	-5.289
2016	10.618
2017	3.806
2018	12.474
2019	-8.354
2020	0.160
2021	1.957
2022	-14.688
2023	17.270
2024	13.151
2025	8.419
2026	9.258
2027	9.146
2028	7.966
2029	7.533