Year	Ratio
1978-01-01	0.954469978809357
1979-01-01	0.951409995555878
1980-01-01	0.974039971828461
1981-01-01	0.990899980068207
1982-01-01	0.996169984340668
1983-01-01	0.988179981708527
1984-01-01	0.992320001125336
1985-01-01	0.992470026016235
1986-01-01	1.002769947052000
1987-01-01	1.003059983253480
1988-01-01	1.007949948310850
1989-01-01	1.008929967880250
1990-01-01	1.022269964218140
1991-01-01	1.013949990272520
1992-01-01	1.017560005187990
1993-01-01	1.026260018348690
1994-01-01	1.028249979019170
1995-01-01	1.028229951858520
1996-01-01	1.026700019836430
1998-01-01	1.039250016212460
1999-01-01	1.049939990043640
2000-01-01	1.040949940681460
2001-01-01	1.047350049018860
2002-01-01	1.049049973487850
2003-01-01	1.055189967155460
2004-01-01	1.049440026283260
2005-01-01	1.037780046463010
2006-01-01	1.034829974174500
2007-01-01	1.031949996948240
2008-01-01	1.028990030288700
2009-01-01	1.019739985466000
2010-01-01	1.008949995040890
2011-01-01	1.016669988632200
2012-01-01	1.013450026512150
2013-01-01	1.027040004730220
2014-01-01	1.042799949646000
2015-01-01	1.047469973564150
2016-01-01	1.029479980468750