Year	Ratio
1971-01-01	0.979439973831177
1972-01-01	0.963429987430573
1973-01-01	0.994530022144318
1974-01-01	1.003389954566960
1975-01-01	1.002599954605100
1976-01-01	1.093969941139220
1977-01-01	1.081079959869380
1978-01-01	1.090520024299620
1979-01-01	1.081040024757390
1980-01-01	1.108440041542050
1981-01-01	1.111119985580440
1982-01-01	1.135679960250850
1983-01-01	1.130740046501160
1984-01-01	1.132930040359500
1985-01-01	1.125959992408750
1987-01-01	1.038339972496030
1988-01-01	1.025629997253420
1989-01-01	1.038990020751950
1990-01-01	1.045410037040710
1991-01-01	1.046090006828310
1992-01-01	1.043519973754880
1993-01-01	1.138499975204470
1994-01-01	1.131950020790100
1995-01-01	1.150869965553280
1996-01-01	1.173720002174380
1997-01-01	1.193809986114500
1998-01-01	1.253360033035280
1999-01-01	1.261940002441410
2000-01-01	1.270149946212770
2001-01-01	1.263110041618350
2002-01-01	1.213999986648560
2003-01-01	1.182880043983460
2004-01-01	1.031790018081670
2005-01-01	0.995519995689392
2006-01-01	0.995389997959137
2007-01-01	0.992789983749390
2008-01-01	0.993589997291565
2009-01-01	0.992160022258759
2010-01-01	0.989700019359589
2011-01-01	0.989820003509521
2012-01-01	0.986810028553009
2013-01-01	1.133679986000060
2014-01-01	1.135069966316220
2015-01-01	1.140339970588680