Year	Percent change (Units)
1980	43.237
1981	5.204
1982	3.947
1983	2.582
1984	-2.591
1985	15.554
1986	-9.975
1987	-3.519
1988	18.728
1989	7.472
1990	16.833
1991	-5.105
1992	2.105
1993	2.385
1994	17.375
1995	25.559
1996	6.395
1997	15.099
1998	12.717
1999	-2.124
2000	1.898
2001	6.096
2002	0.244
2003	5.006
2004	-0.150
2005	11.583
2006	4.473
2007	5.935
2008	-0.739
2009	-10.680
2010	13.473
2011	2.368
2012	-5.610
2013	-3.807
2014	-7.831
2015	-1.698
2016	6.894
2017	-0.250
2018	-0.371
2019	12.239
2020	-12.933
2021	12.639
2022	-5.290
2023	-12.890
2024	27.109
2025	5.725
2026	4.639
2027	4.435
2028	4.472
2029	3.749