Year	Ratio
1972-01-01	0.209120005369186
1973-01-01	0.169400006532669
1974-01-01	0.174150004982948
1975-01-01	0.175860002636909
1976-01-01	0.222230002284050
1977-01-01	0.229249998927116
1978-01-01	0.228349998593330
1979-01-01	0.249809995293617
1980-01-01	0.262160003185272
1981-01-01	0.256150007247925
1982-01-01	0.270980000495911
1983-01-01	0.292019993066788
1984-01-01	0.312539994716644
1985-01-01	0.309280008077621
1986-01-01	0.334910005331039
1987-01-01	0.352660000324249
1988-01-01	0.381249994039536
1989-01-01	0.399800002574921
1990-01-01	0.424629986286163
1991-01-01	0.449970006942749
1992-01-01	0.490249991416931
1993-01-01	0.519140005111694
1994-01-01	0.554579973220825
1995-01-01	0.591620028018951
1996-01-01	0.627879977226257
1999-01-01	0.667029976844788
2000-01-01	0.675520002841949
2001-01-01	0.679409980773926
2002-01-01	0.693409979343414
2003-01-01	0.722750008106232
2005-01-01	0.813340008258820
2006-01-01	0.840619981288910
2007-01-01	0.862439990043640
2008-01-01	0.881290018558502
2009-01-01	0.865970015525818
2010-01-01	0.951089978218079
2011-01-01	0.984030008316040
2012-01-01	1.026810050010680
2013-01-01	1.045729994773860
2014-01-01	1.061030030250550
2015-01-01	1.072669982910160
2016-01-01	1.074740052223210
2017-01-01	1.110350012779240