Year	Percent change (Units)
1980	5.572
1981	4.100
1982	5.052
1983	1.593
1984	1.600
1985	4.073
1986	6.982
1987	5.811
1988	6.091
1989	4.554
1990	4.134
1991	1.339
1992	-1.080
1993	-0.095
1994	2.531
1995	4.287
1996	4.479
1997	0.411
1998	2.983
1999	2.199
2000	0.347
2001	3.979
2002	0.481
2003	2.949
2004	4.635
2005	5.665
2006	5.854
2007	6.851
2008	0.232
2009	3.307
2010	8.058
2011	5.121
2012	4.569
2013	3.798
2014	5.020
2015	4.968
2016	4.214
2017	3.816
2018	5.671
2019	5.114
2020	-0.273
2021	7.590
2022	4.847
2023	5.507
2024	4.974
2025	5.323
2026	5.299
2027	5.328
2028	5.310
2029	5.262