Year	Percent change (Units)
1980	6.838
1981	8.460
1982	5.700
1983	2.696
1984	1.142
1985	1.129
1986	1.897
1987	4.491
1988	4.822
1989	3.300
1990	3.012
1991	4.511
1992	2.878
1993	-0.699
1994	1.408
1995	3.009
1996	6.966
1997	2.731
1998	2.863
1999	2.187
2000	1.556
2001	1.724
2002	0.240
2003	2.260
2004	6.814
2005	8.966
2006	11.709
2007	13.739
2008	15.068
2009	-4.870
2010	-2.389
2011	1.981
2012	1.829
2013	3.143
2014	4.244
2015	0.939
2016	2.689
2017	0.604
2018	0.100
2019	-0.900
2020	-2.523
2021	2.277
2022	4.960
2023	3.086
2024	2.580
2025	2.382
2026	2.223
2027	2.044
2028	2.018
2029	1.964