Year	Percent change (Units)
1983	3.792
1984	0.880
1985	1.494
1986	2.320
1987	1.351
1988	1.904
1989	3.643
1990	2.974
1991	2.026
1992	0.830
1993	0.945
1994	1.358
1995	-0.780
1996	-0.148
1997	2.256
1998	4.524
1999	6.300
2000	6.145
2001	3.016
2002	1.752
2003	3.605
2004	1.802
2005	-1.555
2006	0.214
2007	16.748
2008	63.252
2009	-2.538
2010	0.386
2011	5.512
2012	5.797
2013	3.419
2014	0.524
2015	3.167
2016	-0.236
2017	3.498
2018	3.382
2019	1.692
2020	3.784
2021	7.854
2022	2.525
2023	-2.707
2024	0.758
2025	3.071
2026	3.458
2027	3.450
2028	3.440
2029	3.535