Year	Percent
1960	-5.92949
1961	-4.08839
1962	-7.47837
1963	-6.94513
1964	-2.05463
1965	-3.70459
1966	-4.23397
1967	-2.32944
1968	-4.63073
1969	-2.61788
1970	0.23999
1971	-3.01214
1972	-2.9067
1973	-0.60539
1974	8.49474
1975	-6.27832
1976	-2.20966
1977	-2.87236
1978	-7.5131
1979	-3.22137
1980	2.24203
1981	0.31228
1982	-0.33957
1983	4.27774
1984	-2.16501
1985	-3.79294
1986	-4.38334
1987	-4.3617
1988	-4.37137
1989	-0.65825
1990	-1.14931
1991	-5.48627
1992	-9.01934
1993	-9.30559
1994	-5.53423
1995	-4.63514
1996	-4.69255
1997	-8.24846
1998	-12.88379
1999	-10.40646
2000	-9.04828
2001	-5.28352
2002	-6.08135
2003	-0.76637
2004	4.81251
2005	3.45434
2006	9.00558
2007	7.5294
2008	6.94609
2009	2.81818
2010	6.86329
2011	5.70301
2012	9.38363
2013	6.95405
2014	1.32171
2015	-6.19625
2016	-7.42502
2017	-6.89636