Year	Ratio
1971-01-01	0.672599971294403
1972-01-01	0.791499972343445
1973-01-01	0.925159990787506
1974-01-01	1.152060031890870
1975-01-01	1.201200008392330
1976-01-01	1.387169957160950
1977-01-01	1.235839962959290
1978-01-01	1.208359956741330
1979-01-01	1.150429964065550
1980-01-01	1.179739952087400
1981-01-01	1.128880023956300
1982-01-01	1.079890012741090
1983-01-01	1.021759986877440
1984-01-01	0.975880026817322
1985-01-01	0.944199979305267
1986-01-01	0.944480001926422
1987-01-01	1.234269976615910
1988-01-01	1.212159991264340
1989-01-01	1.260560035705570
1990-01-01	1.274930000305180
1991-01-01	1.203299999237060
1992-01-01	1.193979978561400
1993-01-01	1.123309969902040
1994-01-01	1.035560011863710
1995-01-01	0.972440004348755
1996-01-01	0.941810011863709
1998-01-01	1.062119960784910
1999-01-01	1.081779956817630
2000-01-01	1.073590040206910
2001-01-01	1.110960006713870
2002-01-01	1.073819994926450
2003-01-01	0.996209979057312
2004-01-01	0.916930019855499
2005-01-01	0.937950015068054
2006-01-01	1.013569951057430
2007-01-01	1.260939955711360
2008-01-01	1.264999985694890
2009-01-01	1.180609941482540
2010-01-01	1.041059970855710
2011-01-01	0.916750013828278
2012-01-01	1.366969943046570
2013-01-01	1.499369978904720
2014-01-01	1.384160041809080
2015-01-01	1.263939976692200
2016-01-01	1.173799991607670