Year	Percent change (Units)
1980	2.314
1981	-0.099
1982	1.908
1983	2.804
1984	0.332
1985	2.243
1986	2.341
1987	1.681
1988	0.961
1989	3.887
1990	4.346
1991	3.442
1992	2.094
1993	0.527
1994	2.402
1995	2.668
1996	2.398
1997	2.094
1998	3.581
1999	3.556
2000	3.376
2001	1.267
2002	1.652
2003	0.941
2004	2.735
2005	2.244
2006	3.454
2007	3.727
2008	1.460
2009	-3.765
2010	1.837
2011	2.923
2012	0.680
2013	0.026
2014	0.661
2015	1.015
2016	1.989
2017	2.259
2018	2.425
2019	1.451
2020	-6.633
2021	4.238
2022	4.806
2023	-0.746
2024	0.435
2025	1.584
2026	1.359
2027	1.003
2028	0.883
2029	0.916