Year	Percent
1970	0.98788
1980	0.9988
1982	1.01094
1983	1.01132
1984	1.02799
1991	1.04301
2006	1.06209
2007	1.0728
2008	1.07486
2010	1.06988
2011	1.06585
2012	1.06463
2013	1.06036
2014	1.0437
2015	1.05813
2016	1.05075