Year	Percent change (Units)
1980	-2.253
1981	-3.877
1982	-2.071
1983	-0.616
1984	4.306
1985	10.294
1986	0.762
1987	4.875
1988	5.326
1989	10.286
1990	7.455
1991	2.760
1992	7.173
1993	7.303
1994	-2.437
1995	0.485
1996	9.998
1997	12.194
1998	2.467
1999	1.872
2000	4.253
2001	-2.271
2002	1.213
2003	-5.887
2004	-2.850
2005	9.006
2006	9.406
2007	10.418
2008	-2.096
2009	-1.095
2010	6.321
2011	5.684
2012	3.820
2013	6.403
2014	4.717
2015	8.913
2016	12.118
2017	6.957
2018	4.937
2019	5.513
2020	-11.741
2021	0.554
2022	14.978
2023	3.679
2024	3.229
2025	3.787
2026	3.762
2027	3.696
2028	3.643
2029	3.590