Year	Percent change (Units)
1983	7.112
1984	-3.531
1985	-4.093
1986	12.230
1987	-1.362
1988	7.867
1989	7.379
1990	15.772
1991	6.729
1992	-2.011
1993	5.805
1994	8.400
1995	8.600
1996	4.681
1997	8.712
1998	3.253
1999	-10.989
2000	5.827
2001	-3.549
2002	-3.960
2003	-10.384
2004	13.686
2005	3.770
2006	-3.017
2007	-7.552
2008	-0.983
2009	-13.682
2010	-12.877
2011	4.665
2012	1.594
2013	-6.170
2014	-4.658
2015	-0.863
2016	-11.729
2017	-0.044
2018	-10.800
2019	-11.500
2020	-65.246
2021	-27.163
2022	31.492
2023	18.197
2024	11.646
2025	0.835