Year	Percent change (Units)
1980	-6.825
1981	12.164
1982	-1.054
1983	3.715
1984	0.155
1985	11.784
1986	3.250
1987	5.503
1988	5.031
1989	1.349
1990	3.458
1991	5.781
1992	1.007
1993	-6.236
1994	-3.829
1995	-7.919
1996	-8.001
1997	0.413
1998	4.752
1999	1.164
2000	1.781
2001	1.665
2002	2.353
2003	2.469
2004	3.766
2005	4.370
2006	5.414
2007	3.452
2008	4.862
2009	3.813
2010	5.124
2011	4.033
2012	4.447
2013	4.924
2014	4.241
2015	-3.900
2016	-0.600
2017	0.500
2018	1.610
2019	1.842
2020	0.335
2021	3.119
2022	1.827
2023	2.659
2024	4.282
2025	5.350
2026	6.045
2027	6.004
2028	5.529
2029	5.012