Year	Ratio
1999-01-01	1.15626001358032
2000-01-01	1.51464998722076
2001-01-01	1.50704002380371
2002-01-01	1.49808001518250
2003-01-01	1.42650997638702
2004-01-01	1.47544002532959
2005-01-01	1.44018995761871
2006-01-01	1.46350002288818
2007-01-01	1.36434996128082
2008-01-01	1.37132000923157
2009-01-01	1.43283998966217
2010-01-01	1.41236996650696
2011-01-01	1.49925994873047
2012-01-01	1.49501001834869
2013-01-01	2.20461010932922
2014-01-01	2.27027988433838
2015-01-01	2.26360011100769