Year	Ratio
1973-01-01	0.418339997529984
1974-01-01	0.419420003890991
1975-01-01	0.493129998445511
1978-01-01	0.460709989070892
1982-01-01	0.595189988613129
1983-01-01	0.715929985046387
1984-01-01	0.741069972515106
1985-01-01	0.731249988079071
1986-01-01	0.711719989776611
1994-01-01	0.930649995803833
1995-01-01	0.971480011940002
1996-01-01	0.958809971809387
1998-01-01	1.157719969749450
1999-01-01	1.152899980545040
2000-01-01	1.112259984016420
2001-01-01	1.103420019149780
2002-01-01	1.100260019302370
2003-01-01	1.081550002098080
2004-01-01	1.097650051116940
2005-01-01	1.115990042686460
2006-01-01	1.116420030593870
2007-01-01	1.123999953269960
2008-01-01	1.115309953689580
2009-01-01	1.108399987220760
2010-01-01	1.104969978332520
2011-01-01	1.087080001831050
2012-01-01	1.078099966049190
2013-01-01	1.087049961090090
2014-01-01	1.096779942512510
2015-01-01	1.106629967689510
2016-01-01	1.120350003242490