Year	Ratio
1972-01-01	0.389620006084442
1973-01-01	0.461389988660812
1974-01-01	0.474370002746582
1975-01-01	0.457060009241104
1976-01-01	0.543720006942749
1977-01-01	0.362289994955063
1978-01-01	0.323709994554520
1979-01-01	0.250660002231598
1980-01-01	0.333600014448166
1981-01-01	0.315730005502701
1982-01-01	0.271869987249374
1983-01-01	0.284520000219345
1984-01-01	0.353210002183914
1985-01-01	0.454939991235733
1986-01-01	0.513639986515045
1987-01-01	0.556389987468719
1988-01-01	0.603779971599579
1989-01-01	0.648850023746490
1990-01-01	0.773840010166168
1991-01-01	0.826940000057220
1992-01-01	0.932240009307861
1993-01-01	0.985759973526001
1994-01-01	1.012920022010800
1995-01-01	0.986810028553009
1996-01-01	1.048159956932070
1997-01-01	1.120030045509340
1998-01-01	1.079120039939880
1999-01-01	1.109240055084230
2000-01-01	1.203729987144470
2001-01-01	1.276960015296940
2002-01-01	1.390930056571960
2003-01-01	1.393740057945250
2004-01-01	1.331439971923830
2005-01-01	1.354239940643310
2006-01-01	1.393249988555910
2007-01-01	1.421479940414430
2008-01-01	1.447669982910160
2009-01-01	1.365300059318540
2010-01-01	1.352079987525940
2011-01-01	1.364019989967350
2012-01-01	1.357270002365110
2013-01-01	1.335240006446840
2014-01-01	1.307199954986570
2015-01-01	1.370380043983460
2016-01-01	1.366670012474060