Year	Ratio
1970-01-01	0.755060017108917
1971-01-01	0.754320025444031
1972-01-01	0.777849972248077
1973-01-01	1.029960036277770
1974-01-01	1.065780043601990
1975-01-01	1.013790011405940
1976-01-01	1.073420047760010
1977-01-01	1.088760018348690
1978-01-01	1.166229963302610
1979-01-01	1.207180023193360
1980-01-01	1.246469974517820
1981-01-01	1.204640030860900
1982-01-01	1.251500010490420
1983-01-01	1.456719994544980
1984-01-01	1.309999942779540
1985-01-01	1.400189995765690
1987-01-01	1.548480033874510
1988-01-01	1.398350000381470
1994-01-01	1.503749966621400
1998-01-01	1.553050041198730
1999-01-01	1.603440046310420
2000-01-01	1.704419970512390
2001-01-01	1.726629972457890
2002-01-01	1.709319949150090
2003-01-01	1.602210044860840
2004-01-01	1.671740055084230
2005-01-01	1.637680053710940
2006-01-01	1.618340015411380
2007-01-01	1.592309951782230
2008-01-01	1.532349944114690
2009-01-01	1.524739980697630
2010-01-01	1.530249953269960
2011-01-01	1.548539996147160
2012-01-01	1.548599958419800
2014-01-01	1.587440013885500
2015-01-01	1.574020028114320