Year	Ratio
1971-01-01	0.615909993648529
1972-01-01	0.749700009822845
1973-01-01	0.804840028285980
1974-01-01	0.821839988231659
1976-01-01	0.845870018005371
1977-01-01	0.936980009078979
1978-01-01	0.918129980564117
1979-01-01	0.926580011844635
1980-01-01	0.988600015640259
1981-01-01	1.005789995193480
1982-01-01	1.033689975738530
1983-01-01	1.004950046539310
1984-01-01	1.018900036811830
1985-01-01	1.024080038070680
1986-01-01	1.024199962615970
1987-01-01	1.047690033912660
1988-01-01	1.077219963073730
1989-01-01	1.100980043411250
1990-01-01	1.124359965324400
1991-01-01	1.149610042572020
1992-01-01	1.167350053787230
1993-01-01	1.081410050392150
1994-01-01	1.091449975967410
1995-01-01	1.115949988365170
1996-01-01	1.214490056037900
1998-01-01	1.292219996452330
1999-01-01	1.335000038146970
2000-01-01	1.365429997444150
2001-01-01	1.333739995956420
2002-01-01	1.386579990386960
2003-01-01	1.408839941024780
2004-01-01	1.403100013732910
2005-01-01	1.380409955978390
2006-01-01	1.383219957351680
2007-01-01	1.402259945869450
2008-01-01	1.434689998626710
2009-01-01	1.455209970474240
2010-01-01	1.448619961738590
2011-01-01	1.425150036811830
2012-01-01	1.415719985961910
2013-01-01	1.389099955558780
2014-01-01	1.413689970970150
2015-01-01	1.401579976081850
2016-01-01	1.364670038223270