Year	Percent
1971	1.04559
1972	1.04477
1973	1.0828
1974	1.00985
1975	1.04221
1977	1.04355
1978	1.0506
1979	1.04691
1980	1.05152
1981	1.09307
1982	1.04917
1983	1.05022
1985	1.0419
1986	1.0378
1987	1.0364
1988	1.03481
1989	1.03342
1990	1.02997
1991	1.02452
1992	1.02164
1993	1.01753
1994	0.99025
1995	0.98698
1996	0.98925
1997	0.99207
1998	0.99353
1999	0.99544
2000	0.99733
2001	0.99939
2002	1.00021
2003	1.00237
2004	1.00033
2005	0.99738
2006	0.99561
2007	0.99592
2008	0.99548
2009	0.99673
2010	0.99989
2011	1.00265
2012	1.00272
2013	1.00456
2014	1.006
2015	1.00362