Year	Ratio
1971-01-01	0.832629978656769
1975-01-01	0.849489986896515
1976-01-01	0.853169977664948
1977-01-01	0.891210019588470
1980-01-01	0.988940000534058
1981-01-01	0.913540005683899
1983-01-01	0.925100028514862
1984-01-01	0.917699992656708
1986-01-01	0.929059982299805
1988-01-01	0.955789983272552
1989-01-01	0.950919985771179
1991-01-01	0.964699983596802
1992-01-01	0.972140014171600
1993-01-01	0.984669983386993
1994-01-01	0.981029987335205
1995-01-01	0.971849977970123
1996-01-01	0.971000015735626
1998-01-01	1.018550038337710
1999-01-01	1.058850049972530
2000-01-01	1.074939966201780
2001-01-01	1.065799951553340
2002-01-01	1.061229944229130
2003-01-01	1.065969944000240
2004-01-01	1.025869965553280
2005-01-01	1.014529943466190
2006-01-01	1.020720005035400
2007-01-01	1.049100041389470
2008-01-01	1.029330015182500
2009-01-01	1.028699994087220
2010-01-01	1.016190052032470
2011-01-01	1.006229996681210
2012-01-01	0.993380010128021
2013-01-01	1.039479970932010
2014-01-01	1.035030007362370
2015-01-01	1.007840037345890