Year	Percent change (Units)
1980	12.321
1981	8.600
1982	16.700
1983	10.400
1984	5.900
1985	7.300
1986	6.400
1987	-1.000
1988	-9.800
1989	6.903
1990	15.369
1991	-9.830
1992	-9.543
1993	0.534
1994	36.116
1995	9.647
1996	0.690
1997	3.973
1998	1.449
1999	-1.935
2000	0.504
2001	2.136
2002	0.164
2003	2.105
2004	0.408
2005	1.171
2006	-1.406
2007	-1.021
2008	5.263
2009	1.885
2010	1.447
2011	1.262
2012	2.683
2013	0.480
2014	4.512
2015	-0.143
2016	2.086
2017	2.652
2018	4.777
2019	2.022
2020	1.703
2021	1.077
2022	4.250
2023	3.634
2024	2.090
2025	2.164
2026	2.234
2027	2.310
2028	2.358
2029	2.421