Year	Percent
1971	0.98398
1972	0.98195
1973	0.99652
1974	0.99071
1975	0.99508
1976	0.99613
1977	1.00327
1978	1.00642
1979	1.00971
1980	1.01231
1981	1.01567
1982	1.01364
1983	1.02303
1984	1.01727
1985	1.01886
1986	1.01291
1987	1.01402
1988	1.01364
1989	1.01452
1990	1.01689
1991	1.0193
1992	1.0171
1993	1.03747
1994	1.03794
1995	1.04532
1996	1.04336
1999	1.04176
2000	1.05728
2001	1.06342
2002	1.06831
2003	1.05752
2004	1.05655
2005	1.06992
2006	1.07475
2007	1.07981
2008	1.08786
2009	1.08961
2010	1.08339
2011	1.0819
2012	1.08251
2013	1.08219
2014	1.07985
2015	1.08055