Year	Percent
1965	-0.50125
1966	-2.5825
1967	-1.95397
1968	-2.50965
1969	0.52429
1970	1.53991
1971	-4.13981
1972	-5.69388
1973	-3.30344
1974	2.63817
1975	-2.85808
1976	-4.72202
1977	-2.7458
1978	-4.46683
1979	-7.16385
1980	0.75336
1981	-6.54707
1982	4.30328
1983	1.09402
1984	2.48517
1985	1.87295
1986	0.55693
1987	-3.93178
1988	0.07134
1989	2.93759
1990	2.86938
1991	5.35898
1992	2.23145
1993	1.38317
1994	2.14178
1995	3.02407
1996	0.08308
1997	-0.08264
1998	0.08038
1999	-0.2702
2000	0.96355
2001	-2.44632
2002	-3.24902
2003	-4.78592
2004	-1.51616
2005	-1.77261
2006	-0.6699
2007	-0.72237
2008	-3.86421
2009	-4.96599
2010	-4.77957
2011	-5.07215
2012	-4.15071
2013	-4.46995
2014	-5.18865
2015	-5.34987
2016	-4.82977
2017	-3.01638