Year	Percent change (Units)
1980	4.555
1981	4.540
1982	1.397
1983	2.058
1984	4.347
1985	2.326
1986	2.971
1987	3.302
1988	2.468
1989	2.658
1990	0.751
1991	-1.103
1992	-0.935
1993	-1.829
1994	3.930
1995	3.935
1996	1.579
1997	3.071
1998	4.312
1999	4.247
2000	4.766
2001	1.449
2002	2.197
2003	2.310
2004	4.337
2005	2.859
2006	4.663
2007	3.439
2008	-0.451
2009	-4.340
2010	5.952
2011	3.195
2012	-0.588
2013	1.188
2014	2.658
2015	4.489
2016	2.071
2017	2.568
2018	1.950
2019	1.986
2020	-2.170
2021	6.147
2022	2.663
2023	-0.196
2024	0.215
2025	2.223
2026	2.175
2027	2.195
2028	2.123
2029	2.117