Year	Percent
1960	1.89267
1961	1.93225
1962	1.94603
1963	1.90081
1964	1.78125
1965	1.61509
1966	1.43198
1967	1.27535
1968	1.17085
1969	1.13661
1970	1.15169
1971	1.18318
1972	1.19812
1973	1.19004
1974	1.14723
1975	1.08184
1976	1.00276
1977	0.93779
1978	0.91037
1979	0.93381
1980	0.98661
1981	1.01534
1982	1.00849
1983	0.99835
1984	0.9849
1985	0.9467
1986	0.98269
1987	0.96512
1988	0.65736
1989	-0.03113
1990	-0.9639
1991	-2.0786
1992	-3.0766
1993	-3.63081
1994	-3.46398
1995	-2.69772
1996	-1.66146
1997	-0.74201
1998	-0.05187
1999	0.22992
2000	0.20165
2001	0.12146
2002	0.11986
2003	0.09106
2004	0.05396
2005	0.00643
2006	-0.05454
2007	-0.14478
2008	-0.27598
2009	-0.45373
2010	-0.65546
2011	-0.89649
2012	-1.10849
2013	-1.19124
2014	-1.08764
2015	-0.846
2016	-0.54291
2017	-0.27902