Year	Percent
1970	-11.55582
1971	-11.55713
1972	-11.55689
1973	-11.55357
1974	-11.5582
1975	-11.55332
1976	-11.56367
1977	-11.55568
1978	-11.53698
1979	-11.58133
1980	-11.52892
1981	-11.61546
1982	-11.51572
1983	-11.4435
1984	-11.80303
1985	-11.26688
1986	-12.04814
1987	-11.01702
1988	-11.08243
1989	-13.60069
1990	-10.6364
1991	-7.13376
1992	-1.31033
1993	-2.52741
1994	-1.29647
1995	-2.50539
1996	-1.99822
1997	-2.90702
1998	-3.9994
1999	-2.79397
2000	-2.81593
2001	-2.89088
2002	-1.67518
2003	-0.68326
2004	0.73214
2005	2.67401
2006	0.23833
2007	2.70511
2008	-3.78201
2009	2.00548
2010	4.84859
2011	3.24685
2012	5.15579
2013	3.87696
2014	4.89362
2015	2.6968