Year	Percent change (Units)
1980	3.304
1981	0.100
1982	3.900
1983	6.000
1984	6.000
1985	-0.100
1986	2.400
1987	0.800
1988	-0.500
1989	-5.800
1990	-5.612
1991	-12.927
1992	-8.766
1993	1.528
1994	3.932
1995	7.138
1996	3.948
1997	-6.053
1998	-4.818
1999	-1.150
2000	2.921
2001	5.218
2002	5.703
2003	2.341
2004	10.428
2005	4.668
2006	8.029
2007	7.234
2008	9.307
2009	-5.517
2010	-3.901
2011	4.517
2012	1.925
2013	0.270
2014	4.121
2015	3.160
2016	2.858
2017	8.197
2018	6.029
2019	3.853
2020	-3.677
2021	5.709
2022	4.595
2023	2.110
2024	2.771
2025	3.601
2026	3.849
2027	3.849
2028	3.600
2029	3.500