Year	Percent change (Units)
1980	7.240
1981	4.045
1982	2.442
1983	1.652
1984	2.298
1985	1.650
1986	-0.225
1987	0.754
1988	1.060
1989	2.601
1990	3.621
1991	2.797
1992	0.981
1993	1.101
1994	0.809
1995	-0.575
1996	0.526
1997	2.078
1998	0.535
1999	-1.013
2000	-0.766
2001	-0.910
2002	-0.536
2003	-0.308
2004	0.527
2005	-0.760
2006	0.368
2007	0.512
2008	1.073
2009	-2.000
2010	-0.255
2011	-0.302
2012	-0.245
2013	1.397
2014	2.551
2015	0.197
2016	0.267
2017	0.549
2018	0.868
2019	0.510
2020	-0.916
2021	0.513
2022	3.871
2023	2.921
2024	2.012
2025	1.994
2026	2.004
2027	2.004
2028	2.004
2029	2.004