Year	Percent change (Units)
1980	3.006
1981	0.393
1982	-0.054
1983	-3.067
1984	12.825
1985	4.275
1986	5.316
1987	12.033
1988	5.962
1989	8.550
1990	9.630
1991	1.798
1992	7.115
1993	-11.195
1994	8.050
1995	9.555
1996	-0.429
1997	10.390
1998	9.036
1999	4.495
2000	10.991
2001	2.431
2002	0.563
2003	0.740
2004	4.573
2005	3.441
2006	7.959
2007	5.454
2008	-4.025
2009	-13.118
2010	12.167
2011	0.563
2012	-8.120
2013	-2.702
2014	3.453
2015	6.464
2016	3.927
2017	6.091
2018	3.438
2019	-0.700
2020	-12.128
2021	15.555
2022	12.913
2023	-0.537
2024	0.213
2025	0.963
2026	1.161
2027	1.691
2028	1.466
2029	1.643