Year	Percent
1960	1.65791
1961	1.46301
1962	1.287
1963	1.14835
1964	1.06598
1965	1.05357
1966	1.02647
1967	1.00692
1968	0.99463
1969	1.01388
1970	1.04019
1971	1.08637
1972	1.11255
1973	1.13347
1974	1.11759
1975	1.09687
1976	1.07152
1977	1.03763
1978	1.00265
1979	0.96559
1980	0.91457
1981	0.86585
1982	0.81048
1983	0.76028
1984	0.73334
1985	0.70599
1986	0.68773
1987	0.66132
1988	0.60255
1989	0.51306
1990	0.39238
1991	0.28702
1992	0.17515
1993	0.08237
1994	0.03422
1995	-0.00647
1996	-0.04348
1997	-0.06572
1998	-0.07595
1999	-0.03892
2000	0.01668
2001	0.08338
2002	0.14621
2003	0.18846
2004	0.19271
2005	0.17027
2006	0.14978
2007	0.12847
2008	0.10815
2009	0.08058
2010	0.05673
2011	0.02378
2012	-0.01189
2013	-0.00732
2014	0.03384
2015	0.08957
2016	0.17161
2017	0.23139