Year	Percent change (Units)
1980	4.910
1981	-1.326
1982	2.755
1983	12.539
1984	7.613
1985	8.333
1986	2.949
1987	7.138
1988	6.261
1989	12.116
1990	8.639
1991	7.776
1992	7.464
1993	3.302
1994	10.752
1995	6.905
1996	10.862
1997	6.743
1998	-0.368
1999	3.463
2000	2.144
2001	6.293
2002	0.166
2003	1.054
2004	-0.060
2005	-0.673
2006	-1.576
2007	0.738
2008	1.806
2009	-4.428
2010	-3.306
2011	-2.393
2012	0.097
2013	-2.790
2014	3.402
2015	3.257
2016	-1.565
2017	3.174
2018	-2.324
2019	0.362
2020	4.679
2021	5.215
2022	-0.320
2023	0.938
2024	3.633
2025	2.795
2026	1.477
2027	1.482
2028	1.486
2029	1.490