Year	Percent
1960	1.4695
1961	1.1106
1962	1.11146
1963	1.11053
1964	1.1111
1965	1.11073
1966	0.56882
1967	0.5695
1968	0.56938
1969	0.56924
1970	0.56908
1971	0.57425
1972	0.57325
1973	0.5745
1974	0.57347
1975	0.57392
1976	0.70319
1977	0.70268
1978	0.70289
1979	0.70305
1980	0.70966
1981	0.6675
1982	0.62829
1983	0.59825
1984	0.75735
1985	0.77669
1986	0.71757
1987	0.69738
1988	0.6483
1989	0.5866
1990	0.38579
1991	0.22363
1992	0.04372
1993	-0.11372
1994	-0.12397
1995	0.02678
1996	-0.14547
1997	-0.16532
1998	-0.16551
1999	-0.30948
2000	-0.42057
2001	-0.42415
2002	-0.46006
2003	-0.45372
2004	-0.40261
2005	-0.38147
2006	-0.32732
2007	-0.17102
2008	-0.04394
2009	0.03011
2010	0.04489
2011	0.07797
2012	0.1683
2013	0.21292
2014	0.2177
2015	0.19256
2016	0.17024
2017	0.1057