Year	Percent change (Units)
1980	14.464
1981	11.200
1982	7.014
1983	6.807
1984	5.271
1985	4.410
1986	1.790
1987	5.664
1988	11.758
1989	6.189
1990	8.191
1991	6.497
1992	4.883
1993	5.207
1994	0.800
1995	2.183
1996	3.010
1997	3.393
1998	5.743
1999	1.983
2000	1.099
2001	4.264
2002	0.722
2003	4.220
2004	2.827
2005	2.303
2006	2.483
2007	4.811
2008	7.726
2009	3.655
2010	3.689
2011	7.282
2012	3.416
2013	2.909
2014	0.519
2015	1.375
2016	3.863
2017	3.348
2018	4.081
2019	1.773
2020	-2.595
2021	0.156
2022	4.320
2023	2.300
2024	4.000
2025	3.200
2026	3.100
2027	3.000
2028	2.900
2029	2.800