Year	Percent change (Units)
1980	-2.995
1981	12.954
1982	-3.572
1983	-6.027
1984	9.912
1985	3.733
1986	7.193
1987	0.000
1988	1.718
1989	3.790
1990	1.364
1991	-0.799
1992	-4.923
1993	-1.198
1994	12.572
1995	3.166
1996	-6.157
1997	4.105
1998	3.340
1999	2.887
2000	-3.581
2001	2.609
2002	2.091
2003	-2.249
2004	-0.096
2005	2.931
2006	4.754
2007	4.031
2008	2.613
2009	2.812
2010	4.631
2011	4.195
2012	5.054
2013	-36.392
2014	0.080
2015	4.338
2016	4.750
2017	4.528
2018	3.820
2019	2.970
2020	0.959
2021	0.983
2022	0.472
2023	0.727
2024	1.269
2025	1.720
2026	1.946
2027	2.111
2028	2.341
2029	2.551