Year	Percent change (Units)
1980	-1.400
1981	-5.357
1982	-11.500
1983	-1.539
1984	-22.760
1985	-21.800
1986	54.622
1987	32.787
1988	7.039
1989	-1.230
1990	87.444
1991	9.743
1992	9.690
1993	5.224
1994	8.637
1995	5.053
1996	-6.207
1997	15.948
1998	12.751
1999	2.705
2000	23.913
2001	22.004
2002	64.971
2003	5.682
2004	-11.115
2005	-18.215
2006	2.255
2007	4.229
2008	-3.687
2009	-4.377
2010	7.084
2011	-18.971
2012	9.395
2013	6.230
2014	7.317
2015	-0.688
2016	4.575
2017	1.436
2018	0.769
2019	16.283
2020	-2.401
2021	8.831
2022	-0.427
2023	10.035
2024	1.198
2025	3.634
2026	1.736
2027	1.804
2028	0.905
2029	3.772