Year	Ratio
1972-01-01	0.626190006732941
1973-01-01	0.638520002365112
1974-01-01	0.667219996452332
1975-01-01	0.677250027656555
1976-01-01	0.695479989051819
1977-01-01	0.717260003089905
1978-01-01	0.732159972190857
1979-01-01	0.738039970397949
1980-01-01	0.746559977531433
1981-01-01	0.766569972038269
1982-01-01	0.782530009746552
1983-01-01	0.798680007457733
1984-01-01	0.806289970874786
1985-01-01	0.806540012359619
1986-01-01	0.828249990940094
1987-01-01	0.845059990882874
1988-01-01	0.857159972190857
1989-01-01	0.856310009956360
1990-01-01	0.857550024986267
1991-01-01	0.864369988441467
1992-01-01	0.867730021476746
1993-01-01	0.939350008964539
1994-01-01	0.957409977912903
1995-01-01	0.907970011234283
1996-01-01	0.909839987754822
1999-01-01	0.947000026702881
2000-01-01	0.952780008316040
2001-01-01	0.954750001430511
2002-01-01	0.955889999866486
2004-01-01	1.013010025024410
2005-01-01	1.012529969215390
2006-01-01	1.023380041122440
2007-01-01	1.022729992866520
2008-01-01	1.014330029487610
2009-01-01	1.015540003776550
2010-01-01	1.023319959640500
2011-01-01	1.026180028915410
2012-01-01	1.023399949073790
2013-01-01	1.019919991493230
2014-01-01	1.020709991455080
2015-01-01	1.022799968719480
2016-01-01	1.029620051383970