Year	Percent change (Units)
1980	-4.545
1981	-19.841
1982	-14.851
1983	20.930
1984	-4.808
1985	-4.040
1986	-12.632
1987	13.253
1988	-8.309
1989	-1.332
1990	10.085
1991	-10.139
1992	13.575
1993	14.881
1994	2.791
1995	10.359
1996	7.950
1997	27.032
1998	3.101
1999	2.872
2000	13.155
2001	-1.436
2002	4.425
2003	3.136
2004	2.044
2005	3.137
2006	7.747
2007	2.388
2008	1.145
2009	-10.408
2010	13.251
2011	6.910
2012	0.638
2013	6.282
2014	2.040
2015	3.893
2016	0.952
2017	3.358
2018	1.181
2019	8.159
2020	-23.674
2021	27.328
2022	10.739
2023	4.573
2024	2.707
2025	2.309
2026	2.349
2027	2.773
2028	3.194
2029	3.195