Year	Ratio
1971-01-01	0.722100019454956
1972-01-01	0.730419993400574
1973-01-01	0.738059997558594
1974-01-01	0.740740001201630
1975-01-01	0.752420008182526
1976-01-01	0.768090009689331
1977-01-01	0.790679991245270
1978-01-01	0.810989975929260
1979-01-01	0.839550018310547
1980-01-01	0.859769999980927
1981-01-01	0.888310015201569
1982-01-01	0.875549972057343
1983-01-01	0.944769978523254
1984-01-01	0.957819998264313
1985-01-01	0.997810006141663
1986-01-01	1.014060020446780
1987-01-01	1.022920012474060
1988-01-01	1.018429994583130
1989-01-01	1.013139963150020
1990-01-01	1.032899975776670
1991-01-01	1.012680053710940
1992-01-01	1.012369990348820
1993-01-01	1.019860029220580
1994-01-01	1.021510004997250
1995-01-01	1.010499954223630
1996-01-01	0.995109975337982
1997-01-01	0.982689976692200
1998-01-01	0.988499999046326
1999-01-01	0.992299973964691
2000-01-01	1.015660047531130
2001-01-01	1.038529992103580
2002-01-01	1.024219989776610
2003-01-01	1.031389951705930
2004-01-01	1.036239981651310
2005-01-01	1.035889983177190
2006-01-01	1.051360011100770
2011-01-01	1.017789959907530
2012-01-01	1.009840011596680
2013-01-01	1.018890023231510
2014-01-01	1.015269994735720
2015-01-01	1.012300014495850
2016-01-01	1.020830035209660