Year	Percent change (Units)
1980	-3.811
1981	6.902
1982	1.439
1983	-0.547
1984	2.481
1985	1.924
1986	18.584
1987	10.016
1988	7.571
1989	9.408
1990	9.859
1991	1.760
1992	3.227
1993	3.106
1994	2.401
1995	4.826
1996	3.842
1997	3.103
1998	2.604
1999	2.951
2000	1.760
2001	1.055
2002	4.380
2003	3.880
2004	3.624
2005	5.999
2006	5.992
2007	4.435
2008	0.822
2009	1.565
2010	3.794
2011	2.247
2012	5.397
2013	3.861
2014	0.923
2015	2.227
2016	1.063
2017	2.027
2018	2.380
2019	2.692
2020	-1.560
2021	10.683
2022	0.476
2023	5.133
2024	3.699
2025	3.267
2026	3.193
2027	3.232
2028	2.937
2029	2.711