Year	Percent change (Units)
1980	16.100
1981	7.700
1982	5.486
1983	6.311
1984	5.442
1985	4.491
1986	6.607
1987	-10.211
1988	1.135
1989	5.609
1990	3.951
1991	6.077
1992	4.217
1993	6.109
1994	4.000
1995	4.100
1996	-1.667
1997	2.554
1998	3.668
1999	1.755
2000	0.377
2001	6.002
2002	3.176
2003	1.633
2004	-0.740
2005	-0.351
2006	-0.997
2007	3.578
2008	13.665
2009	9.816
2010	-3.900
2011	1.497
2012	-3.046
2013	-1.488
2014	2.104
2015	0.572
2016	1.917
2017	0.356
2018	0.564
2019	-1.813
2020	2.553
2021	2.054
2022	5.346
2023	9.277
2024	4.469
2025	3.000
2026	2.500
2027	2.000
2028	1.900
2029	1.800