Year	Percent change
1980	9.67
1981	3.313
1982	-14.57
1983	-10.907
1984	-9.904
1985	0.484
1986	34.027
1987	19.047
1988	4.246
1989	13.536
1990	19.711
1991	-8.358
1992	8.315
1993	11.11
1994	-7.449
1995	0.04
1996	12.345
1997	14.949
1998	5.284
1999	8.466
2000	5.787
2001	-18.664
2002	13.914
2003	-6.798
2004	-12.39
2005	23.083
2006	10.405
2007	-17.107
2008	-4.048
2009	22.013
2010	7.62
2011	-3.547
2012	-11.254
2013	-8.278
2014	3.488
2015	-12.125
2016	-14.228
2017	28.422
2018	28.228
2019	15.048
2020	-1.004
2021	-1.941
2022	-9.98
2023	-7.695
2024	-2.812