Year	Ratio
1971-01-01	0.792509973049164
1972-01-01	1.049729943275450
1973-01-01	0.822899997234344
1974-01-01	0.800499975681305
1978-01-01	1.290060043334960
1979-01-01	0.942719995975494
1980-01-01	0.897329986095428
1981-01-01	0.791519999504089
1982-01-01	0.680869996547699
1983-01-01	0.859640002250671
1984-01-01	0.911729991436005
1985-01-01	0.899930000305176
1986-01-01	1.044610023498540
1987-01-01	1.000910043716430
1988-01-01	1.096009969711300
1989-01-01	1.250470042228700
1990-01-01	1.371039986610410
1991-01-01	1.208170056343080
1992-01-01	1.647619962692260
1993-01-01	0.995280027389526
1994-01-01	1.158049941062930
1995-01-01	1.274489998817440
1996-01-01	1.424550056457520
1997-01-01	1.222519993782040
1999-01-01	1.248299956321720
2000-01-01	1.314429998397830
2001-01-01	1.365049958229060
2002-01-01	1.258669972419740
2003-01-01	1.033710002899170
2004-01-01	0.980250000953674
2005-01-01	1.132339954376220
2006-01-01	1.047770023345950
2007-01-01	0.993799984455109
2008-01-01	0.958239972591400
2009-01-01	0.871909976005554
2010-01-01	0.896960020065308
2011-01-01	1.032480001449580
2012-01-01	1.179049968719480
2013-01-01	1.290599942207340
2014-01-01	1.419370055198670
2015-01-01	1.357720017433170