Year	Ratio
1971-01-01	1.156990051269530
1972-01-01	0.990190029144287
1973-01-01	1.143630027771000
1974-01-01	1.144320011138920
1975-01-01	1.145570039749150
1976-01-01	1.100160002708440
1977-01-01	1.093780040740970
1978-01-01	1.083199977874760
1979-01-01	1.005349993705750
1980-01-01	1.002709984779360
2001-01-01	1.069540023803710
2002-01-01	1.085540056228640
2003-01-01	1.129390001297000
2004-01-01	1.158779978752140
2005-01-01	1.131440043449400
2006-01-01	1.089370012283330
2010-01-01	1.180750012397770
2011-01-01	1.175480008125310
2012-01-01	1.163769960403440
2013-01-01	1.166739940643310
2014-01-01	1.139400005340580
2015-01-01	1.116029977798460