Year	Ratio
1971-01-01	0.802980005741119
1972-01-01	0.819369971752167
1973-01-01	0.832019984722137
1974-01-01	0.845579981803894
1975-01-01	0.856440007686615
1976-01-01	0.873780012130737
1977-01-01	0.866869986057281
1978-01-01	0.865800023078918
1979-01-01	0.866580009460449
1980-01-01	0.863259971141815
1981-01-01	0.852410018444061
1982-01-01	0.867479979991913
1983-01-01	0.886089980602264
1984-01-01	0.908640027046204
1985-01-01	0.932319998741150
1986-01-01	0.946510016918182
1987-01-01	0.929539978504181
1988-01-01	0.921559989452362
1989-01-01	0.919409990310669
1990-01-01	0.934880018234253
1992-01-01	0.991190016269684
1993-01-01	0.995729982852936
1994-01-01	1.023779988288880
1995-01-01	1.062319993972780
1996-01-01	1.099779963493350
1997-01-01	1.101009964942930
1998-01-01	1.083709955215450
1999-01-01	1.038669943809510
2000-01-01	1.017660021781920
2001-01-01	1.010910034179690
2003-01-01	1.027619957923890
2004-01-01	1.058680057525630
2005-01-01	1.094030022621150
2006-01-01	1.078430056571960
2007-01-01	1.047899961471560
2008-01-01	1.069409966468810
2009-01-01	1.044780015945430
2010-01-01	1.022989988327030
2011-01-01	0.978789985179901
2012-01-01	1.061550021171570
2013-01-01	1.051010012626650
2014-01-01	1.066509962081910
2015-01-01	1.079120039939880