Year	Ratio
1971-01-01	0.941209971904755
1972-01-01	0.933770000934601
1973-01-01	0.941399991512299
1974-01-01	0.945339977741241
1989-01-01	0.970610022544861
1990-01-01	0.972190022468567
1991-01-01	0.992139995098114
1992-01-01	1.004420042037960
1993-01-01	0.997900009155273
1994-01-01	1.025480031967160
1995-01-01	1.029060006141660
1996-01-01	1.021329998970030
1997-01-01	1.004690051078800
1998-01-01	1.018810033798220
1999-01-01	1.023049950599670
2000-01-01	1.024219989776610
2001-01-01	1.023130059242250
2002-01-01	1.024680018424990
2003-01-01	1.024580001831050
2004-01-01	1.020509958267210
2005-01-01	1.018990039825440
2006-01-01	1.011240005493160
2007-01-01	1.000319957733150
2008-01-01	0.997009992599487
2009-01-01	0.998510003089905
2010-01-01	0.992030024528503
2011-01-01	0.987219989299774
2012-01-01	0.987299978733063
2013-01-01	0.982810020446777
2014-01-01	0.989459991455078
2015-01-01	0.993950009346008
2016-01-01	0.992309987545013