Year	Percent
1970	0.98741
1971	0.98984
1972	0.98853
1973	0.98531
1974	0.99717
1975	0.99293
1976	0.99854
1977	1.00175
1978	1.00425
1979	1.00637
1980	1.01208
1981	1.0126
1982	1.01298
1983	1.01076
1984	1.00625
1985	1.00658
1986	1.01
1987	1.00552
1988	1.00813
1989	1.00782
1990	1.00038
1999	1.00678
2000	1.00357
2001	1.00612
2002	1.00339
2004	1.00566
2005	1.0034
2006	1.00815
2007	1.00447
2008	1.00484
2009	1.00603
2010	1.00009
2011	1.00892
2013	1.00794
2014	1.01502
2015	1.00686