Year	Percent change
1981	1.63
1982	3.699
1983	12.023
1984	7.978
1985	3.205
1986	2.929
1987	3.701
1988	2.978
1989	2.604
1990	-0.047
1991	-2.291
1992	1.311
1993	9.763
1994	16.616
1995	15.67
1996	4.381
1997	13.39
1998	8.248
1999	6.155
2000	13.315
2001	-1.167
2002	-0.058
2003	5.097
2004	11.274
2005	5.957
2006	9.385
2007	4.556
2008	0.95
2009	-19.209
2010	14.867
2011	8.528
2012	-0.556
2013	-3.781
2014	3.587
2015	2.77
2016	2.908
2017	4.12
2018	3.93
2019	3.3
2020	3.1
2021	3.1
2022	3.1
2023	3.1
2024	3.1