Year	Percent
1960	-0.50054
1961	0.47064
1962	0.30819
1963	0.11389
1964	-3.80162
1965	-1.31017
1966	-6.90143
1967	-0.82042
1968	-0.78605
1969	-1.04677
1970	-2.76376
1971	-6.39719
1972	-4.52631
1973	-2.4347
1974	-2.84937
1975	-5.1278
1976	-7.49599
1977	-9.34456
1978	3.15138
1979	2.60733
1980	0.12657
1981	-3.00108
1982	-1.80301
1983	-1.05261
1984	-0.1043
1985	1.87673
1986	0.67947
1987	-2.88036
1988	-2.32303
1989	0.65105
1990	0.29924
1991	0
1992	-1.12994
1993	2.22883
1994	2.73387
1995	4.75605
1996	-0.31073
1997	3.75
1998	-3.09913
1999	6.09368
2000	-4.11518
2001	-1.06657
2002	2.02584
2003	-6.03047
2004	-3.87739
2005	-6.42624
2006	-4.56306
2007	-1.99823
2008	-5.71669
2009	-9.3193
2010	-8.5253
2011	-6.16691
2012	-6.74569
2013	-4.57422
2014	-5.02577
2015	-3.8813
2016	-5.15288
2017	-3.82827