Year	Ratio
1971-01-01	0.996850013732910
1972-01-01	0.997889995574951
1973-01-01	1.000429987907410
1974-01-01	1.005089998245240
1975-01-01	1.007680058479310
1976-01-01	1.010830044746400
1977-01-01	1.014209985733030
1978-01-01	1.016530036926270
1979-01-01	1.021989941596980
1980-01-01	1.026200056076050
1981-01-01	1.031710028648380
1982-01-01	1.031319975852970
1983-01-01	1.030220031738280
1984-01-01	1.028939962387080
1985-01-01	1.027269959449770
1986-01-01	1.036849975585940
1987-01-01	1.026229977607730
1988-01-01	1.026569962501530
1989-01-01	1.029690027236940
1990-01-01	1.034309983253480
1991-01-01	1.037799954414370
1992-01-01	1.036059975624080
1993-01-01	0.988170027732849
1994-01-01	0.990409970283508
1995-01-01	0.994509994983673
1996-01-01	0.998939990997314
1997-01-01	1.003260016441350
1998-01-01	1.006139993667600
1999-01-01	1.006790041923520
2000-01-01	1.009840011596680
2001-01-01	1.008409976959230
2002-01-01	1.014099955558780
2003-01-01	1.034119963645940
2004-01-01	1.028720021247860
2005-01-01	1.030030012130740
2006-01-01	1.030320048332210
2007-01-01	1.020239949226380
2008-01-01	1.016829967498780
2009-01-01	1.011510014534000
2010-01-01	1.003739953041080
2011-01-01	1.007769942283630
2012-01-01	1.000929951667790
2013-01-01	1.045130014419560
2014-01-01	1.040249943733220
2015-01-01	1.031640052795410