Year	Ratio
1971-01-01	0.391640007495880
1972-01-01	0.402520000934601
1973-01-01	0.432889997959137
1974-01-01	0.442140012979507
1975-01-01	0.451469987630844
1976-01-01	0.471029996871948
1977-01-01	0.438719987869263
1978-01-01	0.441170006990433
1979-01-01	0.460229992866516
1980-01-01	0.467570006847382
1981-01-01	0.482670009136200
1982-01-01	0.483900010585785
1983-01-01	0.488489985466003
1984-01-01	0.478830009698868
1985-01-01	0.508800029754639
1986-01-01	0.433690011501312
1987-01-01	0.409409999847412
1988-01-01	0.499700009822845
1989-01-01	0.517279982566834
1990-01-01	0.532249987125397
1991-01-01	0.583649992942810
2001-01-01	0.791130006313324
2002-01-01	0.816910028457642
2003-01-01	0.868120014667511
2004-01-01	0.809360027313232
2005-01-01	0.841250002384186
2006-01-01	0.879710018634796
2007-01-01	0.763490021228790
2008-01-01	0.933380007743835
2009-01-01	0.898850023746490
2010-01-01	0.916239976882935
2011-01-01	0.910030007362366
2012-01-01	0.894240021705627
2013-01-01	0.892599999904633
2014-01-01	0.894649982452393
2015-01-01	0.962499976158142
2016-01-01	1.023599982261660