Year	Percent change (Units)
1980	-0.100
1981	-4.200
1982	3.200
1983	1.200
1984	0.900
1985	6.700
1986	9.800
1987	0.900
1988	3.900
1989	0.000
1990	7.917
1991	6.505
1992	-4.988
1993	11.675
1994	19.112
1995	16.601
1996	10.854
1997	-10.009
1998	-2.046
1999	-5.215
2000	-4.925
2001	18.631
2002	11.039
2003	4.028
2004	8.782
2005	15.701
2006	-0.071
2007	17.124
2008	3.747
2009	-6.328
2010	15.367
2011	2.135
2012	6.385
2013	-6.147
2014	2.486
2015	-9.201
2016	-3.061
2017	-0.577
2018	6.004
2019	0.016
2020	-7.260
2021	11.012
2022	3.512
2023	-9.283
2024	9.791
2025	8.046
2026	8.059
2027	5.797
2028	5.505
2029	5.790