Year	Percent
1960	0.43654
1961	-0.00391
1962	-0.44441
1963	-0.86905
1964	-1.18462
1965	-1.44439
1966	-1.75465
1967	-2.04315
1968	-2.08576
1969	-1.88833
1970	-1.43556
1971	-0.87268
1972	-0.38054
1973	-0.02256
1974	0.03384
1975	-0.12414
1976	-0.28951
1977	-0.4677
1978	-0.54538
1979	-0.56448
1980	-0.57
1981	-0.54301
1982	-0.4992
1983	-0.5158
1984	-0.58466
1985	-0.66661
1986	-0.75499
1987	-0.83326
1988	-0.73789
1989	-0.4762
1990	-0.04407
1991	0.4374
1992	0.84493
1993	1.16578
1994	1.25152
1995	1.21506
1996	1.11751
1997	1.08464
1998	1.06849
1999	1.13754
2000	1.21955
2001	1.34847
2002	1.4056
2003	1.41572
2004	1.39595
2005	1.32532
2006	1.2247
2007	1.15767
2008	1.09675
2009	1.09468
2010	1.09254
2011	1.08458
2012	1.11859
2013	1.09305
2014	1.06635
2015	1.01642
2016	0.97701
2017	0.9513