Year	Percent change (Units)
1980	14.901
1981	-10.498
1982	-20.067
1983	4.579
1984	13.442
1985	-0.600
1986	-0.515
1987	3.898
1988	3.556
1989	3.041
1990	-3.585
1991	0.760
1992	8.533
1993	17.908
1994	13.329
1995	2.200
1996	12.386
1997	19.900
1998	22.100
1999	4.400
2000	0.800
2001	8.487
2002	1.906
2003	0.646
2004	5.593
2005	5.695
2006	5.571
2007	14.101
2008	1.921
2009	-20.691
2010	9.121
2011	10.756
2012	1.115
2013	-0.769
2014	4.741
2015	18.104
2016	1.486
2017	2.915
2018	2.627
2019	-0.983
2020	-8.438
2021	22.325
2022	4.147
2023	-3.314
2024	4.604
2025	4.384
2026	4.289
2027	3.926
2028	3.795
2029	2.981