Year	Percent
1976	-0.1556
1977	5.01609
1978	-13.61519
1979	8.25025
1980	13.13848
1981	-2.67191
1982	-12.10226
1983	-9.57406
1984	-1.14398
1985	-8.62415
1986	-19.64665
1987	-2.48026
1988	-8.2136
1989	5.92826
1990	11.70408
1991	-4.76405
1992	-2.43055
1993	-4.27876
1994	1.32886
1995	1.454
1996	0.76983
1997	3.02172
1998	-4.5893
1999	-2.26387
2000	4.99325
2001	-3.81737
2002	-2.85873
2003	1.9764
2004	0.29283
2005	-6.4014
2006	-4.04354
2007	-10.50796
2008	-9.53391
2009	-14.78631
2010	-5.82072
2011	1.97625
2012	1.80834
2013	3.81913
2014	3.65515
2015	4.10711
2016	1.70731
2017	-0.6092