Year	Ratio
1973-01-01	1.026440024375920
1974-01-01	1.003909945487980
1975-01-01	1.005710005760190
1976-01-01	1.011289954185490
1977-01-01	1.013200044631960
1978-01-01	1.014310002326970
1979-01-01	1.018700003623960
1980-01-01	1.016219973564150
1983-01-01	1.009799957275390
1984-01-01	1.022660017013550
1985-01-01	1.031209945678710
1986-01-01	1.030719995498660
1987-01-01	1.022809982299800
1988-01-01	1.036560058593750
1989-01-01	1.013849973678590
1990-01-01	1.029469966888430
1991-01-01	1.031149983406070
1992-01-01	1.009870052337650
1993-01-01	1.005890011787410
1994-01-01	0.999970018863678
1999-01-01	0.988420009613037
2000-01-01	0.989639997482300
2001-01-01	0.996969997882843
2002-01-01	0.996710002422333
2003-01-01	0.997470021247864
2004-01-01	1.001710057258610
2005-01-01	1.005349993705750
2006-01-01	1.008679986000060
2007-01-01	1.009269952774050
2008-01-01	1.006899952888490
2009-01-01	1.005399942398070
2010-01-01	1.004410028457640
2011-01-01	1.004809975624080
2012-01-01	1.004770040512080
2013-01-01	1.002869963645940
2014-01-01	1.003839969635010
2015-01-01	1.006629943847660
2016-01-01	1.009109973907470