Year	Percent
1960	-8.22481
1961	-0.91023
1962	11.75943
1963	16.79389
1964	3.59389
1965	-2.4
1966	-5.16975
1967	-2.35128
1968	3.09032
1969	3.81067
1970	-0.54145
1971	3.72274
1972	-1.30152
1973	-16.70285
1974	1.92731
1975	-0.02526
1976	-24.92738
1977	-15.5597
1978	-0.01578
1979	-9.4186
1980	-12.35412
1981	-23.38761
1982	-17.3029
1983	-18.69891
1984	-7.19783
1985	-13.79487
1986	-6.90783
1987	-11.19424
1988	-4.3016
1989	-7.19264
1990	-17.15289
1991	-22.12597
1992	-25.25042
1993	-19.84588
1994	-12.97804
1995	-10.90603
1996	-6.09491
1997	-9.81654
1998	-11.97767
1999	-8.04237
2000	-14.60865
2001	-16.4255
2002	-12.68835
2003	-9.97704
2004	-9.8643
2005	-34.58365
2006	-27.29818
2007	-26.68344
2008	-33.00239
2009	-24.93821
2010	-27.72245
2011	-30.12402
2012	-28.30272
2013	-26.99325
2014	-28.24425
2015	-18.76483
2016	-8.63864
2017	-13.4317