Year	Percent
1960	-6.59434
1961	-4.89859
1962	-4.6285
1963	-7.14587
1964	-6.62505
1965	-6.78829
1966	-5.90335
1967	-3.98981
1968	-5.03984
1969	-5.00228
1970	-2.42529
1971	-6.58098
1972	-4.06026
1973	-4.63088
1974	-4.68099
1975	-5.03062
1976	-2.36096
1977	-3.60398
1978	-6.90636
1979	-15.81175
1980	-16.3951
1981	-11.31097
1982	-9.4413
1983	-6.96359
1984	-4.62585
1985	-8.26626
1986	-3.39835
1987	-5.94143
1988	-6.79965
1989	-3.82214
1990	-11.42504
1991	-8.57908
1992	-8.28349
1993	-9.29781
1994	-7.56658
1995	-7.57697
1996	-5.51185
1997	-8.09385
1998	-7.75685
1999	-7.74417
2000	-7.32579
2001	-3.21359
2002	-6.56547
2003	-8.98775
2004	-14.84745
2005	-17.3404
2006	-16.0401
2007	-21.74349
2008	-30.36713
2009	-29.2579
2010	-18.07449
2011	-15.59086
2012	-10.50615
2013	-8.68738
2014	-4.38042
2015	-3.46677
2016	-2.2626
2017	-3.61671