Year	Percent change (Units)
1980	-14.588
1982	0.300
1983	10.200
1984	6.200
1985	2.600
1986	-0.300
1987	6.000
1988	0.400
1989	8.000
1990	3.400
1991	0.575
1992	5.989
1993	2.135
1994	-6.118
1995	5.733
1996	5.749
1997	11.257
1998	1.653
1999	3.518
2000	3.325
2001	-1.696
2002	5.798
2003	6.754
2004	2.729
2005	4.954
2006	-3.007
2007	-1.882
2008	-3.568
2009	-8.443
2010	-3.218
2011	-4.822
2012	-3.652
2013	-6.394
2014	0.311
2015	5.733
2016	9.612
2017	0.042
2018	-7.913
2019	-2.954
2020	-4.154
2021	15.855
2022	28.717
2023	9.262
2024	2.194
2025	1.200
2026	0.700
2027	0.200
2028	0.200
2029	0.200