Year	Percent change (Units)
1980	19.700
1981	12.700
1982	5.300
1983	3.700
1984	0.795
1985	2.440
1986	1.848
1987	2.452
1988	3.885
1989	5.379
1990	5.779
1991	5.787
1992	4.018
1993	3.380
1994	5.054
1995	5.795
1996	5.823
1997	5.630
1998	7.962
1999	0.236
2000	1.700
2001	1.610
2002	0.660
2003	1.813
2004	2.812
2005	4.467
2006	4.712
2007	2.167
2008	5.485
2009	-0.870
2010	3.299
2011	3.811
2012	3.012
2013	2.185
2014	1.894
2015	-0.899
2016	0.188
2017	0.665
2018	1.065
2019	0.706
2020	-0.847
2021	1.231
2022	6.077
2023	1.228
2024	0.700
2025	1.209
2026	1.688
2027	2.000
2028	2.000
2029	2.000