Year	Percent change (Units)
1980	-1.244
1981	-11.402
1982	-10.711
1983	-13.353
1984	-0.448
1985	8.559
1986	-12.033
1987	-2.164
1988	6.530
1989	12.927
1990	12.700
1991	10.933
1992	16.118
1993	5.056
1994	-6.883
1995	16.383
1996	1.723
1997	5.528
1998	25.609
1999	16.745
2000	8.634
2001	4.732
2002	-0.290
2003	2.804
2004	8.150
2005	-1.383
2006	4.659
2007	9.584
2008	-0.466
2009	-1.821
2010	5.799
2011	2.900
2012	1.951
2013	5.975
2014	6.927
2015	2.838
2016	2.359
2017	1.490
2018	-0.370
2019	0.232
2020	-7.526
2021	10.258
2022	6.968
2023	-4.708
2024	2.890
2025	3.324
2026	3.514
2027	3.821
2028	4.241
2029	4.950