Year	Percent change
1980	13.641
1981	4.3
1982	5
1983	4.3
1984	-1.8
1985	-3.2
1986	-4.1
1987	-3.39
1988	-7.814
1989	3.074
1990	15.15
1991	-4.148
1992	11.769
1993	-11.31
1994	6.895
1995	3.294
1996	20.075
1997	6.437
1998	0.471
1999	13.624
2000	-4.574
2001	-3.838
2002	1.587
2003	-3.586
2004	18.245
2005	4.416
2006	1.151
2007	-11.148
2008	-4.608
2009	11.056
2010	-7.723
2011	4.12
2012	7.125
2013	3.567
2014	11.296
2015	4.328
2016	-10.056
2017	9.444
2018	9.035
2019	7.916
2020	7.396
2021	8.239
2022	7.901
2023	6.924
2024	6.439