Year	Ratio
1973-01-01	1.11073994636536
1974-01-01	1.10933005809784
1975-01-01	1.18264997005463
1976-01-01	1.17244994640350
1977-01-01	1.11372005939484
1979-01-01	1.11140000820160
1980-01-01	1.13516998291016
1981-01-01	1.14634001255035
1983-01-01	1.10887002944946
1984-01-01	1.09598004817963
1985-01-01	1.09439003467560
1986-01-01	1.13129997253418
1987-01-01	1.07410001754761
1988-01-01	1.07837998867035
1989-01-01	1.10863995552063
1991-01-01	1.07516002655029
1993-01-01	1.06119000911713
1999-01-01	1.01511001586914
2000-01-01	1.02746999263763
2001-01-01	1.02626001834869
2002-01-01	1.03594005107880
2003-01-01	1.03947997093201
2004-01-01	1.04463005065918
2005-01-01	1.06140005588531
2007-01-01	1.06634998321533
2008-01-01	1.06410002708435
2009-01-01	1.02841997146606
2010-01-01	1.08232998847961
2011-01-01	1.08384001255035
2013-01-01	1.07604002952576
2014-01-01	1.08043003082275
2015-01-01	1.07385003566742
2016-01-01	1.05248999595642