Year	Percent change (Units)
1980	4.677
1981	1.741
1982	0.446
1983	7.089
1984	7.652
1985	7.315
1986	2.223
1987	0.949
1988	6.203
1989	11.172
1990	8.102
1991	6.194
1992	4.707
1993	3.111
1994	8.305
1995	5.387
1996	10.074
1997	7.715
1998	1.311
1999	2.946
2000	3.904
2001	4.581
2002	-0.582
2003	-0.333
2004	1.157
2005	0.558
2006	-0.571
2007	0.779
2008	1.108
2009	-4.333
2010	0.341
2011	-0.514
2012	2.056
2013	-1.651
2014	3.834
2015	3.926
2016	0.388
2017	1.595
2018	-1.537
2019	2.116
2020	-2.329
2021	6.091
2022	4.499
2023	1.449
2024	3.373
2025	2.728
2026	1.710
2027	1.715
2028	1.720
2029	1.725