Year	Percent change (Units)
1980	-1.443
1981	6.624
1982	-3.807
1983	-3.783
1984	-5.293
1985	9.500
1986	4.222
1987	98.796
1988	-13.017
1989	-3.236
1990	1.927
1991	9.117
1992	6.479
1993	18.315
1994	-12.024
1995	5.158
1996	18.728
1997	21.433
1998	28.668
1999	-3.303
2000	-16.265
2001	35.343
2002	-8.067
2003	-6.621
2004	-0.246
2005	17.743
2006	3.081
2007	-11.492
2008	-1.452
2009	2.043
2010	-8.884
2011	0.746
2012	12.841
2013	1.923
2014	22.112
2015	9.364
2016	7.507
2017	6.398
2018	13.689
2019	0.302
2020	-28.250
2021	9.073
2022	8.742
2023	10.664
2024	2.930
2025	9.899
2026	4.912
2027	4.564
2028	3.454
2029	3.609