Year	Percent change (Units)
1980	4.022
1981	6.486
1982	5.671
1983	2.950
1984	2.937
1985	3.427
1986	0.743
1987	1.435
1988	1.872
1989	3.154
1990	5.404
1991	5.859
1992	4.037
1993	3.293
1994	0.851
1995	1.798
1996	0.810
1997	0.518
1998	0.019
1999	0.808
2000	1.561
2001	0.991
2002	0.641
2003	0.636
2004	0.801
2005	1.173
2006	1.064
2007	0.735
2008	2.428
2009	-0.480
2010	0.688
2011	0.228
2012	-0.693
2013	-0.216
2014	-0.012
2015	-1.142
2016	-0.434
2017	0.535
2018	0.935
2019	0.362
2020	-0.725
2021	0.582
2022	2.834
2023	2.134
2024	1.537
2025	1.200
2026	1.164
2027	1.182
2028	1.200
2029	1.200