Year	Percent
1970	1.01711
1971	1.0076
1972	1.00561
1973	1.01113
1974	1.0154
1975	1.01217
1976	1.02163
1977	1.01453
1978	1.01223
1979	1.01475
1980	1.01217
1981	1.01823
1982	0.99645
1983	1.00231
1984	0.99968
1985	1.00315
1986	1.00093
1989	1.00718
1990	1.01042
1991	0.99652
1992	0.99991
1993	1.00889
1998	0.99905
1999	0.9988
2000	0.99503
2002	0.99424
2003	0.99219
2004	0.9816
2005	0.98229
2006	0.98637
2007	0.98679
2008	0.98601
2009	0.98909
2010	1.00095
2011	1.00001
2012	1.00264
2013	0.99214
2014	0.99203
2015	0.9911
2016	0.99206