Year	Percent change
1980	24.982
1981	1.715
1982	7.13
1983	-8.379
1984	-2.867
1985	-9.382
1986	-18.335
1987	-9.254
1988	10.214
1989	2.931
1990	6.6
1991	125.095
1992	-18.85
1993	-1.446
1994	-2.957
1995	3.83
1996	2.567
1997	-0.126
1998	13.443
1999	-9.07
2000	-12.456
2001	6.981
2002	6.978
2003	13.016
2004	14.977
2005	12.226
2006	4.712
2007	24.744
2008	3.793
2009	-12.492
2010	6.33
2011	5.168
2012	13.964
2013	-0.085
2014	7.952
2015	6.836
2016	4.204
2017	11.452
2018	2.85
2019	3.24
2020	3.584
2021	3.986
2022	3.652
2023	3.099
2024	3.266