Year	Ratio
1971-01-01	1.06324994564056
1972-01-01	1.17568004131317
1973-01-01	1.21318995952606
1974-01-01	1.27750003337860
1975-01-01	1.36152005195618
1976-01-01	1.39287996292114
1977-01-01	1.44376003742218
1978-01-01	1.75001001358032
1979-01-01	1.44659996032715
1980-01-01	1.41066002845764
1981-01-01	1.35144996643066
1982-01-01	1.22760999202728
1983-01-01	1.18447005748749
1984-01-01	1.20485997200012
1985-01-01	1.21447002887726
1986-01-01	1.25171995162964
1987-01-01	1.29448997974396
1988-01-01	1.30944001674652
1989-01-01	1.22827005386353
1990-01-01	1.15380001068115
1991-01-01	1.10218000411987
1992-01-01	1.19142997264862
1993-01-01	1.39189994335175
1994-01-01	1.48740994930267
1995-01-01	1.59727001190186
1996-01-01	1.70457994937897
1997-01-01	1.65821003913879
1998-01-01	1.63695001602173
1999-01-01	1.54386997222900
2000-01-01	1.41357004642487
2001-01-01	1.36215996742249
2002-01-01	1.24304997920990
2003-01-01	1.18756997585297
2004-01-01	1.17588996887207
2005-01-01	1.16062998771667
2006-01-01	1.22713005542755
2007-01-01	1.23862004280090
2008-01-01	1.31886994838715
2009-01-01	1.33003997802734
2010-01-01	1.32313001155853
2011-01-01	1.30004000663757
2012-01-01	1.27499997615814
2013-01-01	1.27152001857758
2014-01-01	1.25979995727539
2015-01-01	1.27655005455017
2016-01-01	1.24537003040314