Year	Percent
1970	1.03324
1971	1.02991
1972	1.02278
1973	1.02952
1974	1.02659
1975	1.03028
1976	1.02729
1977	1.02866
1978	1.03748
1979	1.02321
1980	1.02485
1981	1.02457
1982	1.01255
1984	1.01809
1985	1.02794
1986	1.01476
1987	1.01621
1988	1.05676
1996	1.02535
1997	1.02837
1998	1.01708
1999	1.03151
2000	1.02402
2001	1.02517
2002	1.02438
2003	1.02716
2004	1.03168
2005	1.03587
2006	1.04249
2007	1.04801
2008	1.051
2009	1.04798
2010	1.03598
2011	1.03974
2012	1.03373
2013	1.0301
2014	1.02966
2015	1.02662