Year	Ratio
1970-01-01	0.183070003986359
1972-01-01	0.214650005102158
1973-01-01	0.169809997081757
1974-01-01	0.180370002985001
1975-01-01	0.191259995102882
1976-01-01	0.262470006942749
1977-01-01	0.295690000057220
1978-01-01	0.325839996337891
1979-01-01	0.381379991769791
1980-01-01	0.407299995422363
1981-01-01	0.385280013084412
1982-01-01	0.398750007152557
1983-01-01	0.407310009002686
1984-01-01	0.432390004396439
1985-01-01	0.446610003709793
1986-01-01	0.450919985771179
1987-01-01	0.459479987621307
1988-01-01	0.487029999494553
1989-01-01	0.551779985427856
1990-01-01	0.585609972476959
1991-01-01	0.619520008563995
1992-01-01	0.647159993648529
1993-01-01	0.658640027046204
1994-01-01	0.680599987506866
1995-01-01	0.693570017814636
1996-01-01	0.712769985198975
1999-01-01	0.750400006771088
2000-01-01	0.773159980773926
2001-01-01	0.824069976806641
2002-01-01	0.845619976520538
2003-01-01	0.873489975929260
2004-01-01	0.878570020198822
2005-01-01	0.915409982204437
2006-01-01	0.961419999599457
2007-01-01	0.997420012950897
2008-01-01	1.019860029220580
2009-01-01	1.042459964752200
2010-01-01	1.067350029945370
2011-01-01	1.081760048866270
2012-01-01	1.080620050430300
2013-01-01	1.077900052070620
2014-01-01	1.080940008163450
2015-01-01	1.081859946250920
2016-01-01	1.080080032348630
2017-01-01	1.063680052757260