Year	Percent
1970	0.98631
1971	0.98436
1972	0.97685
1973	0.98173
1974	0.9915
1975	0.99298
1978	0.99862
1981	0.96042
1982	0.96858
1984	1.01721
1985	1.03713
1986	1.00784
1990	0.98822
1991	1.0085
1993	0.99511
1998	1.04589
1999	1.03588
2000	1.02132
2001	1.01974
2002	1.02004
2006	0.98107
2007	0.84403
2008	0.99111
2009	1.11361
2010	1.02034
2011	0.97714
2012	1.01539
2013	1.01673
2014	1.03597