Year	Percent change (Units)
1980	16.399
1981	2.533
1982	2.816
1983	8.826
1984	1.653
1985	14.528
1986	6.532
1987	11.568
1988	3.900
1989	3.658
1990	7.093
1991	15.135
1992	5.571
1993	6.317
1994	7.694
1995	3.552
1996	11.373
1997	14.224
1998	-0.659
1999	4.522
2000	9.833
2001	3.589
2002	0.745
2003	-1.520
2004	4.031
2005	3.053
2006	2.024
2007	1.871
2008	3.793
2009	3.461
2010	7.597
2011	0.544
2012	6.962
2013	6.282
2014	6.987
2015	5.674
2016	7.104
2017	2.084
2018	4.566
2019	1.845
2020	-4.365
2021	0.935
2022	0.220
2023	1.781
2024	1.386
2025	2.058
2026	1.902
2027	1.964
2028	1.983
2029	1.986