Year	Percent
1960	1.25166
1961	1.20737
1962	0.97005
1963	1.01502
1964	0.8956
1965	0.94217
1966	0.92347
1967	0.54604
1968	0.53346
1969	0.88165
1970	0.41987
1971	0.26369
1972	0.55725
1973	0.39365
1974	0.11762
1975	-0.29426
1976	-0.35024
1977	-0.14791
1978	-0.01
1979	0.12255
1980	0.28571
1981	0.35117
1982	0.06642
1983	-0.26762
1984	-0.56477
1985	-0.54205
1986	-0.08359
1987	0.45475
1988	0.61422
1989	0.74182
1990	1.05637
1991	0.93491
1992	0.88447
1993	0.84397
1994	0.63624
1995	0.58111
1996	0.5745
1997	0.42784
1998	0.29588
1999	0.34191
2000	0.41194
2001	0.44131
2002	0.43914
2003	0.32432
2004	0.24521
2005	0.20812
2006	0.14877
2007	0.12717
2008	0.06745
2009	0.00225
2010	0.10048
2011	-1.60197
2012	0.20069
2013	0.28586
2014	0.42983
2015	0.87866
2016	0.8383
2017	0.46759