Year	Percent change
1980	1.443
1981	-4.953
1982	-26.02
1983	-6.91
1984	6.669
1985	6.395
1986	-9.55
1987	-2.479
1988	-6.817
1989	-1.335
1990	-8.753
1991	36.027
1992	30.507
1993	19.811
1994	7.963
1995	8.256
1996	14.8
1997	-4.634
1998	17.999
1999	-2.015
2000	9.029
2001	0.273
2002	-1.102
2003	-7.38
2004	1.76
2005	-8.032
2006	-8.963
2007	2.026
2008	-6.011
2009	-4.223
2010	-1.957
2011	8.934
2012	18.437
2013	5.299
2014	-2.317
2015	9.399
2016	19.176
2017	2.842
2018	3.629
2019	7.954
2020	66.164
2021	41.16
2022	18.646
2023	46.039
2024	24.728