Year	Ratio
1972-01-01	0.0000000000000000
1973-01-01	0.0243400000035763
1974-01-01	0.0800999999046326
1975-01-01	0.0424599982798100
1976-01-01	0.0529399998486042
1977-01-01	0.0528599992394447
1985-01-01	0.0930899977684021
1996-01-01	0.1512400060892110
1997-01-01	0.1729300022125240
1998-01-01	0.1612399965524670
2000-01-01	0.1782999932765960
2001-01-01	0.1784300059080120
2003-01-01	0.1149199977517130
2004-01-01	0.1446399986743930
2005-01-01	0.0646599978208542
2008-01-01	0.1474300026893620
2009-01-01	0.1738000065088270
2010-01-01	0.1748699992895130
2011-01-01	0.2390400022268300
2014-01-01	0.1974100023508070