Year	Ratio
1971-01-01	0.777760028839111
1972-01-01	0.778789997100830
1973-01-01	0.704320013523102
1974-01-01	0.825500011444092
1975-01-01	0.801039993762970
1976-01-01	0.841600000858307
1977-01-01	0.825230002403259
1978-01-01	0.823880016803741
1979-01-01	0.780960023403168
1980-01-01	0.784640014171600
1981-01-01	0.772140026092529
1982-01-01	0.778750002384186
1983-01-01	0.769400000572205
1984-01-01	0.795220017433167
1985-01-01	0.808920025825500
1986-01-01	0.849669992923737
1987-01-01	0.907620012760162
1988-01-01	0.928009986877441
1989-01-01	0.963360011577606
1990-01-01	0.975660026073456
1991-01-01	0.933149993419647
1992-01-01	0.890290021896362
1993-01-01	0.916190028190613
1994-01-01	0.913839995861053
1995-01-01	0.935100018978119
1996-01-01	1.062340021133420
1997-01-01	1.044639945030210
1998-01-01	1.046959996223450
1999-01-01	1.092280030250550
2000-01-01	1.127279996871950
2001-01-01	1.206419944763180
2002-01-01	1.247640013694760
2003-01-01	1.245779991149900
2004-01-01	1.271059989929200
2005-01-01	1.264140009880070
2006-01-01	1.304900050163270
2007-01-01	1.342389941215520
2008-01-01	1.358800053596500
2009-01-01	1.359770059585570
2010-01-01	1.373080015182500
2011-01-01	1.353449940681460
2012-01-01	1.264999985694890
2013-01-01	1.242670059204100
2014-01-01	1.235129952430730
2015-01-01	1.228060007095340
2016-01-01	1.238430023193360