Year	Percent
1960	-7.64743
1961	-7.20997
1962	-7.27205
1963	-8.03211
1964	-9.84158
1965	-11.27138
1966	-7.64597
1967	-7.52041
1968	-8.83999
1969	-9.01891
1970	-7.34409
1971	-7.00547
1972	-7.05784
1973	-8.45536
1974	-7.0455
1975	-7.03968
1976	-6.78133
1977	-6.70113
1978	-5.83113
1979	-5.18465
1980	-5.93767
1981	-4.36141
1982	-7.43333
1983	-8.22327
1984	-7.29656
1985	-8.12038
1986	-7.263
1987	-6.0702
1988	-6.98408
1989	-8.89235
1990	-10.57113
1991	-10.19351
1992	-9.06491
1993	-8.93036
1994	-7.2719
1995	-8.25731
1996	-8.92232
1997	-6.8297
1998	-9.67511
1999	-8.86544
2000	-10.97892
2001	-10.56248
2002	-10.12329
2003	-11.10089
2004	-8.48221
2005	-8.2764
2006	-10.50222
2007	-12.48383
2008	-12.60658
2009	-9.77947
2010	-8.62469
2011	-6.77379
2012	-4.44978
2013	-2.81229
2014	-2.40337
2015	0.05166
2016	-0.7224
2017	-1.07639