Year	Percent change (Units)
1980	10.113
1981	10.816
1982	7.102
1983	8.554
1984	8.792
1985	-0.623
1986	1.343
1987	10.798
1988	11.264
1989	10.159
1990	9.821
1991	6.688
1992	6.640
1993	11.460
1994	11.096
1995	7.175
1996	7.471
1997	8.316
1998	-2.191
1999	5.718
2000	9.038
2001	-1.071
2002	3.923
2003	4.548
2004	9.940
2005	7.366
2006	9.007
2007	9.022
2008	1.863
2009	0.128
2010	14.520
2011	6.215
2012	4.435
2013	4.818
2014	3.936
2015	2.977
2016	3.589
2017	4.513
2018	3.517
2019	1.345
2020	-3.870
2021	9.691
2022	3.838
2023	1.075
2024	2.100
2025	2.300
2026	2.523
2027	2.487
2028	2.483
2029	2.501