Year	Percent change (Units)
1980	-4.407
1981	1.628
1982	-3.693
1983	4.977
1984	9.751
1985	3.158
1986	5.204
1987	7.298
1988	6.434
1989	13.886
1990	6.024
1991	2.439
1992	8.063
1993	7.529
1994	15.480
1995	15.930
1996	12.842
1997	16.645
1998	27.775
1999	12.617
2000	21.686
2001	13.101
2002	5.339
2003	-2.418
2004	1.905
2005	12.723
2006	9.303
2007	9.351
2008	-2.787
2009	-1.702
2010	0.569
2011	2.642
2012	-1.016
2013	1.085
2014	14.664
2015	32.355
2016	19.004
2017	1.180
2018	2.467
2019	42.323
2020	-1.729
2021	-7.507
2022	15.901
2023	0.406
2024	2.470
2025	3.500
2026	3.800
2027	3.800
2028	3.800
2029	3.800