Year	Percent change (Units)
1980	13.118
1981	-10.178
1982	8.354
1983	1.987
1984	1.527
1985	-2.937
1986	0.627
1987	15.447
1988	-10.517
1989	14.154
1990	7.179
1991	12.085
1992	6.856
1993	2.443
1994	3.473
1995	10.562
1996	-0.142
1997	5.883
1998	1.918
1999	4.749
2000	8.989
2001	2.830
2002	-1.026
2003	8.142
2004	27.103
2005	8.508
2006	8.080
2007	12.409
2008	14.787
2009	-13.379
2010	-2.207
2011	-6.804
2012	-8.283
2013	10.736
2014	-12.789
2015	18.818
2016	-6.494
2017	2.324
2018	18.346
2019	9.638
2020	-4.414
2021	-10.430
2022	30.624
2023	2.334
2024	-8.189
2025	2.747
2026	8.703
2027	8.833
2028	8.036
2029	6.903