Year	Ratio
1971-01-01	0.979359984397888
1972-01-01	0.988380014896393
1973-01-01	0.992160022258759
1974-01-01	0.994449973106384
1975-01-01	1.001559972763060
1976-01-01	1.001029968261720
1977-01-01	1.005310058593750
1978-01-01	1.001999974250790
1979-01-01	1.002879977226260
1980-01-01	1.001070022583010
1981-01-01	1.001330018043520
1982-01-01	1.001739978790280
1983-01-01	1.000859975814820
1984-01-01	0.999769985675812
1985-01-01	1.000110030174260
1986-01-01	0.996710002422333
1987-01-01	0.998260021209717
1988-01-01	1.000550031661990
1989-01-01	0.999189972877502
1990-01-01	0.994520008563995
1991-01-01	0.993110001087189
1992-01-01	0.991500020027161
1994-01-01	0.985379993915558
1995-01-01	0.985710024833679
1996-01-01	0.983609974384308
1997-01-01	0.981149971485138
1998-01-01	0.982760012149811
1999-01-01	0.979780018329620
2000-01-01	0.981119990348816
2001-01-01	0.981580018997192
2002-01-01	0.982209980487823
2003-01-01	0.984529972076416
2004-01-01	0.984269976615906
2005-01-01	0.979610025882721
2006-01-01	0.982330024242401
2007-01-01	0.982240021228790
2008-01-01	0.986949980258942
2009-01-01	0.991500020027161
2010-01-01	0.993550002574921
2011-01-01	0.995310008525848
2012-01-01	0.994589984416962
2013-01-01	0.992200016975403
2014-01-01	0.992860019207001
2015-01-01	0.996399998664856
2016-01-01	0.997120022773743