Year	Percent
1971	1.03034
1972	1.02995
1973	1.02988
1974	1.03009
1975	1.03027
1976	1.03063
1977	1.03045
1978	1.03065
1979	1.03159
1982	1.04685
1983	1.04665
1984	1.02848
1985	1.02766
1986	1.02707
1987	1.10227
1988	1.10461
1989	0.96519
1990	0.94171
1991	0.98152
1992	1.0798
1993	1.05036
1994	1.00964
1995	1.0211
1996	1.02159
1997	1.02152
1998	1.02836
1999	1.02323
2000	1.01072
2001	1.01728
2002	1.01431
2003	1.01259
2004	1.00547
2005	1.00722
2006	1.0088
2007	1.00705
2008	1.00632
2009	1.00643
2010	1.00232
2011	0.99925
2012	1.00091
2013	1.00473
2014	1.00299
2015	1.00716