Year	Percent
1961	-15.373
1962	7.02777
1963	2.14948
1964	4.12231
1965	1.70347
1966	2.12944
1967	10.96016
1968	-2.76952
1969	-3.65362
1970	19.0838
1971	1.28758
1972	-7.42485
1973	5.86024
1974	-1.82682
1975	-0.75321
1976	5.97513
1977	9.09097
1978	-3.28367
1979	-0.85664
1980	-1.54811
1981	9.338
1982	-3.56965
1983	1.0263
1984	-2.52979
1985	8.67426
1986	0.27525
1987	2.41121
1988	1.9999
1989	-1.41587
1990	0.91222
1991	2.59771
1992	-1.11491
1993	-8.03123
1994	-5.47131
1995	-9.31696
1996	-9.20391
1997	-2.73292
1998	3.49268
1999	-2.46969
2000	-2.74295
2001	-0.35902
2002	1.56887
2003	-4.22893
2004	1.48628
2005	-2.37356
2006	1.92395
2007	1.29848
2008	1.55996
2009	0.09506
2010	0.49604
2011	1.00513
2012	0.93661
2013	1.53827
2014	1.57558
2015	-6.81766
2016	-3.63952
2017	-2.62782