Year	Percent change (Units)
1980	5.673
1981	1.294
1982	3.087
1983	3.122
1984	3.213
1985	3.537
1986	2.726
1987	3.559
1988	5.211
1989	5.087
1990	0.211
1991	-5.886
1992	-3.295
1993	-0.662
1994	3.964
1995	4.217
1996	3.667
1997	6.334
1998	5.457
1999	4.380
2000	5.773
2001	2.609
2002	1.707
2003	2.004
2004	3.992
2005	2.780
2006	4.027
2007	5.299
2008	0.784
2009	-8.074
2010	3.186
2011	2.547
2012	-1.397
2013	-0.902
2014	-0.365
2015	0.544
2016	2.811
2017	3.192
2018	1.140
2019	1.224
2020	-2.355
2021	2.838
2022	1.335
2023	-0.957
2024	0.422
2025	1.854
2026	1.939
2027	1.688
2028	1.586
2029	1.514