Year	Ratio
1971-01-01	0.775399982929230
1972-01-01	0.825600028038025
1973-01-01	0.879739999771118
1974-01-01	0.898050010204315
1975-01-01	0.933059990406036
1976-01-01	0.973640024662018
1977-01-01	1.038319945335390
1978-01-01	1.065760016441350
1979-01-01	1.053519964218140
1980-01-01	1.047960042953490
1981-01-01	1.033640027046200
1982-01-01	1.088569998741150
1983-01-01	1.114050030708310
1984-01-01	1.169880032539370
1985-01-01	1.178959965705870
1986-01-01	1.205420017242430
1987-01-01	1.207690000534060
1988-01-01	1.195369958877560
1989-01-01	1.190160036087040
1990-01-01	1.083099961280820
1991-01-01	1.061609983444210
1992-01-01	1.058680057525630
1993-01-01	1.074699997901920
1994-01-01	1.124510049819950
1995-01-01	1.131850004196170
1996-01-01	1.190299987792970
1997-01-01	1.191239953041080
1998-01-01	1.230029940605160
1999-01-01	1.240569949150090
2000-01-01	1.223809957504270
2001-01-01	1.269940018653870
2002-01-01	1.293259978294370
2003-01-01	1.367699980735780
2004-01-01	1.397160053253170
2005-01-01	1.462190032005310
2006-01-01	1.464630007743840
2007-01-01	1.454220056533810
2008-01-01	1.433990001678470
2009-01-01	1.373160004615780
2010-01-01	1.362869977951050
2011-01-01	1.333220005035400
2012-01-01	1.313109993934630
2013-01-01	1.293769955635070
2014-01-01	1.294759988784790
2015-01-01	1.257550001144410
2016-01-01	1.247750043869020