Year	Percent change (Units)
1984	-0.820
1985	3.581
1986	1.862
1987	3.655
1988	3.023
1989	6.357
1990	3.678
1991	4.656
1992	3.178
1993	4.312
1994	4.724
1995	7.519
1996	4.720
1997	7.513
1998	4.348
1999	0.595
2000	1.627
2001	0.582
2002	1.592
2003	1.852
2004	2.937
2005	5.707
2006	3.728
2007	2.974
2008	0.481
2009	3.473
2010	3.090
2011	3.537
2012	3.622
2013	1.674
2014	0.597
2015	-0.859
2016	1.125
2017	0.776
2018	0.354
2019	0.878
2020	-0.270
2021	2.166
2022	5.890
2023	-0.834
2024	1.434
2025	1.477
2026	1.900
2027	2.100
2028	1.900
2029	2.100