Year	Percent change (Units)
1980	6.656
1981	7.626
1982	8.723
1983	7.663
1984	6.348
1985	4.868
1986	1.296
1987	1.554
1988	1.162
1989	3.105
1990	3.453
1991	3.167
1992	2.260
1993	2.487
1994	2.394
1995	1.265
1996	1.760
1997	1.499
1998	0.901
1999	1.134
2000	2.682
2001	2.438
2002	1.552
2003	1.517
2004	1.857
2005	2.539
2006	2.331
2007	1.819
2008	4.490
2009	-0.004
2010	2.329
2011	3.344
2012	2.621
2013	1.252
2014	0.495
2015	0.623
2016	1.774
2017	2.222
2018	2.309
2019	1.249
2020	0.421
2021	3.210
2022	10.325
2023	2.293
2024	3.623
2025	1.993
2026	1.883
2027	1.910
2028	2.044
2029	2.023