Year	Percent
1978	0.99062
1979	0.99062
1980	0.9879
1981	0.99631
1982	0.99886
1983	0.99496
1984	0.99543
1985	0.99805
1986	1.00084
1987	1.00271
1988	1.00596
1989	1.00642
1990	1.01413
1991	1.00848
1992	1.00922
1993	1.01381
1994	1.01496
1995	1.01731
1996	1.0133
1998	1.02339
1999	1.0291
2000	1.02386
2001	1.02712
2002	1.02657
2004	1.02443
2005	1.01886
2006	1.01807
2007	1.01705
2008	1.01813
2009	1.0124
2010	1.00576
2011	1.00558
2012	1.00243
2013	1.00905
2014	1.01683
2015	1.01841
2016	1.00967