Year	Ratio
1971-01-01	0.977810025215149
1972-01-01	0.973749995231628
1973-01-01	0.979879975318909
1974-01-01	0.981230020523071
1975-01-01	0.993979990482330
1976-01-01	0.995970010757446
1977-01-01	1.014709949493410
1978-01-01	1.020750045776370
1979-01-01	1.020750045776370
1980-01-01	1.030019998550420
1981-01-01	1.035590052604680
1982-01-01	1.029569983482360
1983-01-01	1.039759993553160
1984-01-01	1.024539947509770
1985-01-01	1.026139974594120
1986-01-01	1.015349984169010
1987-01-01	1.012789964675900
1988-01-01	1.010370016098020
1989-01-01	1.011409997940060
1990-01-01	1.015669941902160
1991-01-01	1.015220046043400
1992-01-01	1.014189958572390
1993-01-01	1.066730022430420
1994-01-01	1.068989992141720
1995-01-01	1.082620024681090
1996-01-01	1.079259991645810
1999-01-01	1.080240011215210
2000-01-01	1.106140017509460
2001-01-01	1.114680051803590
2002-01-01	1.122339963912960
2003-01-01	1.103289961814880
2004-01-01	1.098299980163570
2005-01-01	1.119120001792910
2006-01-01	1.127159953117370
2007-01-01	1.133440017700200
2008-01-01	1.146329998970030
2009-01-01	1.150470018386840
2010-01-01	1.139199972152710
2011-01-01	1.136999964714050
2012-01-01	1.139760017395020
2013-01-01	1.136049985885620
2014-01-01	1.133960008621220
2015-01-01	1.136890053749080