Year	Ratio
1970-01-01	1.11282002925873
1971-01-01	1.10961997509003
1972-01-01	1.09088003635406
1973-01-01	1.07483994960785
1974-01-01	1.10965001583099
1975-01-01	1.10186004638672
1976-01-01	1.08648002147675
1977-01-01	1.09872996807098
1978-01-01	1.10368001461029
1979-01-01	1.10768997669220
1980-01-01	1.12337994575500
1981-01-01	1.12384998798370
1982-01-01	1.12267994880676
1983-01-01	1.12837994098663
1984-01-01	1.12575995922089
1985-01-01	1.11756002902985
1986-01-01	1.12554001808167
1987-01-01	1.11261999607086
1988-01-01	1.10576999187469
1989-01-01	1.09121000766754
1990-01-01	1.07420003414154
1999-01-01	1.07843995094299
2000-01-01	1.06744003295898
2001-01-01	1.07433998584747
2002-01-01	1.06918001174927
2004-01-01	1.07240998744965
2005-01-01	1.07032001018524
2006-01-01	1.08111000061035
2007-01-01	1.07111001014709
2008-01-01	1.07617998123169
2009-01-01	1.07719004154205
2010-01-01	1.06185996532440
2011-01-01	1.07454001903534
2013-01-01	1.06324994564056
2014-01-01	1.07416999340057
2015-01-01	1.05333995819092