Year	Percent change (Units)
1980	-2.039
1981	-13.006
1982	-16.845
1983	-3.362
1984	2.026
1985	1.540
1986	7.662
1987	-10.252
1988	18.940
1989	5.100
1990	0.491
1991	-2.016
1992	7.980
1993	-1.097
1994	-20.257
1995	28.355
1996	7.994
1997	0.996
1998	1.196
1999	-9.632
2000	7.006
2001	10.182
2002	4.050
2003	11.648
2004	10.632
2005	-0.432
2006	1.150
2007	3.948
2008	-1.018
2009	-19.163
2010	19.518
2011	8.491
2012	10.912
2013	1.065
2014	2.381
2015	3.595
2016	0.749
2017	4.853
2018	0.232
2019	4.170
2020	-14.578
2021	22.464
2022	0.200
2023	-4.064
2024	2.112
2025	2.911
2026	3.379
2027	3.426
2028	3.399
2029	3.200