Year	Percent
1970	1.02697
1971	1.03097
1972	1.03529
1973	1.03813
1974	1.04481
1975	1.04203
1976	1.03998
1977	1.03753
1978	1.03946
1979	1.03775
1980	1.03276
1981	1.03508
1982	1.03075
1983	1.06563
1984	1.01767
1985	1.0297
1986	1.03103
1987	1.01892
1988	1.01963
1989	1.02029
1991	1.07579
1992	1.10473
1993	1.0722
1995	1.05305
1996	1.01735
1998	1.02821
1999	1.04348
2000	1.03794
2002	1.03672
2004	1.03858
2005	1.03482
2006	1.04254
2007	1.04631
2008	1.04366
2009	1.04635
2010	1.03843
2011	1.02694
2012	1.02675
2013	1.02698
2014	1.02277
2015	1.01945
2016	1.01756