Year	Percent
1971	0.99236
1972	1.00367
1973	1.00585
1974	0.90586
1975	0.96714
1976	1.05297
1977	1.0461
1978	1.032
1979	1.03291
1980	1.06768
1981	1.00111
1982	1.01762
1983	0.98456
1984	1.01747
1985	0.9904
1989	1.03473
1990	0.95099
1999	1.01564
2000	1.00691
2001	0.9956
2002	0.9954
2003	0.99448
2004	0.99213
2005	0.99309
2006	1.00032
2007	1.00936
2008	1.01275
2009	1.0118
2010	1.01153
2011	1.01788
2014	1.01884
2015	1.01871
2016	1.02982