Year	Ratio
1995-01-01	0.155269995331764
1996-01-01	0.129519999027252
1998-01-01	0.151779994368553
1999-01-01	0.155660003423691
2000-01-01	0.166610002517700
2001-01-01	0.154640004038811
2002-01-01	0.154840007424355
2004-01-01	0.151500001549721
2009-01-01	0.326380014419556
2010-01-01	0.379400014877319
2014-01-01	0.493099987506866
2015-01-01	0.648100018501282
2016-01-01	0.707430005073547