Year	Ratio
1971-01-01	0.402079999446869
1972-01-01	0.410809993743896
1975-01-01	0.467810004949570
1976-01-01	0.504310011863709
1977-01-01	0.529489994049072
1978-01-01	0.553860008716583
1979-01-01	0.578270018100739
1980-01-01	0.642220020294189
1981-01-01	0.688160002231598
1982-01-01	0.729700028896332
1983-01-01	0.752449989318848
1984-01-01	0.755360007286072
1985-01-01	0.731029987335205
1986-01-01	0.724330008029938
1987-01-01	0.748700022697449
1988-01-01	0.780430018901825
1989-01-01	0.803680002689362
1990-01-01	0.818560004234314
1991-01-01	0.829330027103424
1992-01-01	0.866519987583160
1993-01-01	0.887639999389648
1994-01-01	0.893790006637573
1995-01-01	0.931919991970062
1996-01-01	0.943050026893616
1997-01-01	0.969309985637665
1998-01-01	0.984730005264282
1999-01-01	1.009940028190610
2000-01-01	1.036200046539310
2001-01-01	1.058459997177120
2002-01-01	1.066580057144170
2003-01-01	1.080800056457520
2004-01-01	1.077219963073730
2005-01-01	1.083220005035400
2006-01-01	1.091240048408510
2007-01-01	1.103029966354370
2008-01-01	1.109689950942990
2009-01-01	1.115859985351560
2010-01-01	1.115669965744020
2011-01-01	1.116129994392400
2012-01-01	1.100780010223390
2015-01-01	1.144619941711430
2016-01-01	1.128949999809270