Year	Ratio
1971-01-01	1.034119963645940
1972-01-01	1.036999940872190
1973-01-01	1.013509988784790
1974-01-01	1.005130052566530
1975-01-01	1.008020043373110
1976-01-01	1.006270051002500
1977-01-01	1.002120018005370
1978-01-01	0.996590018272400
1979-01-01	0.998520016670227
1980-01-01	1.003299951553340
1981-01-01	1.001870036125180
1982-01-01	0.993740022182465
1983-01-01	0.990999996662140
1984-01-01	0.987990021705627
1985-01-01	0.988960027694702
1986-01-01	0.988919973373413
1987-01-01	1.000659942626950
1988-01-01	0.985759973526001
1989-01-01	0.985599994659424
1990-01-01	0.983950018882751
1991-01-01	0.992380023002625
1992-01-01	0.986069977283478
1993-01-01	0.981850028038025
1994-01-01	0.981209993362427
1995-01-01	0.984640002250671
1996-01-01	0.981869995594025
1997-01-01	0.988719999790192
1998-01-01	0.990140020847321
1999-01-01	0.990700006484985
2000-01-01	0.993030011653900
2001-01-01	0.992529988288879
2002-01-01	0.991240024566650
2003-01-01	0.989579975605011
2004-01-01	0.989960014820099
2005-01-01	0.986720025539398
2006-01-01	0.985970020294189
2007-01-01	0.989130020141602
2008-01-01	0.991989970207214
2009-01-01	0.993960022926331
2010-01-01	0.995320022106171
2011-01-01	0.994579970836639
2012-01-01	0.994889974594116
2013-01-01	1.010929942131040
2014-01-01	1.011139988899230
2015-01-01	1.011530041694640
2016-01-01	1.010969996452330