Year	Percent change (Units)
1980	-7.733
1981	0.181
1982	53.961
1983	10.432
1984	-12.378
1985	-1.469
1986	-2.389
1987	52.515
1988	-0.626
1989	2.629
1990	-2.245
1991	16.939
1992	13.665
1993	19.445
1994	45.425
1995	37.928
1996	28.693
1997	-8.657
1998	-9.320
1999	14.715
2000	5.934
2001	21.163
2002	1.235
2003	4.444
2004	27.230
2005	23.656
2006	-1.271
2007	23.430
2008	18.061
2009	10.325
2010	-9.273
2011	9.845
2012	16.624
2013	2.732
2014	-0.009
2015	2.737
2016	5.607
2017	0.131
2018	16.548
2019	9.103
2020	-11.260
2021	-0.385
2022	-5.353
2023	46.071
2024	4.749
2025	4.291
2026	45.205
2027	-2.350
2028	2.823
2029	1.851