Year	Percent
1960	-1.63861
1961	0.39304
1962	0.41264
1963	-2.63286
1964	-2.27571
1965	0.45218
1966	-1.45468
1967	-2.02307
1968	-1.20594
1969	-2.88922
1970	-6.1964
1971	-0.82079
1972	1.05853
1973	-0.87671
1974	-11.93813
1975	-8.98577
1976	-4.45104
1977	-4.43246
1978	-4.12024
1979	-3.68643
1980	-6.81995
1981	-6.06491
1982	-1.37765
1983	-3.07117
1984	-6.32721
1985	-4.76714
1986	-1.71984
1987	-2.86574
1988	-2.63755
1989	-3.33849
1990	-2.74388
1991	-3.05259
1992	-4.10638
1993	-9.02199
1994	-10.02356
1995	-4.38052
1996	-5.11484
1997	-5.63102
1998	-7.65638
1999	-14.95538
2000	-12.4478
2001	-13.17967
2002	-12.53629
2003	-14.06022
2004	-18.61579
2005	-18.47808
2006	-21.02255
2007	-28.05261
2008	-33.0984
2009	-17.8445
2010	-17.92403
2011	-19.70153
2012	-19.38262
2013	-20.42307
2014	-17.84979
2015	-16.93089
2016	-15.26601
2017	-15.295