Year	Percent change (Units)
1980	6.300
1981	-24.800
1982	-25.000
1983	12.000
1984	15.200
1985	-3.100
1986	13.900
1987	21.900
1988	1.100
1989	10.400
1990	0.400
1991	19.900
1992	15.200
1993	3.300
1994	13.700
1995	7.700
1996	5.500
1997	23.800
1998	8.900
1999	-9.401
2000	17.851
2001	-7.504
2002	-1.242
2003	-0.017
2004	4.950
2005	11.152
2006	2.879
2007	-1.277
2008	10.579
2009	-7.508
2010	2.774
2011	14.321
2012	3.967
2013	1.097
2014	1.726
2015	-1.400
2016	-1.243
2017	11.573
2018	6.463
2019	-8.580
2020	-2.303
2021	23.767
2022	-5.633
2023	4.837
2024	8.504
2025	7.653
2026	11.372
2027	7.400
2028	7.316
2029	6.560