Year	Percent change (Units)
1980	-6.008
1981	-10.805
1982	5.376
1983	15.659
1984	5.256
1985	7.897
1986	5.966
1987	3.647
1988	7.544
1989	1.952
1990	3.202
1991	10.402
1992	2.392
1993	-2.074
1994	5.494
1995	-0.775
1996	2.115
1997	5.653
1998	6.952
1999	-0.683
2000	-0.880
2001	11.658
2002	8.491
2003	14.722
2004	33.629
2005	8.311
2006	1.675
2007	3.886
2008	4.048
2009	2.901
2010	10.463
2011	1.281
2012	6.942
2013	5.637
2014	6.122
2015	1.384
2016	-6.330
2017	-2.030
2018	5.874
2019	6.583
2020	-2.053
2021	-0.914
2022	3.075
2023	4.369
2024	2.912
2025	3.665
2026	2.792
2027	2.640
2028	2.709
2029	2.655