Year	Ratio
2004-01-01	1.07822000980377
2005-01-01	1.27865004539490
2006-01-01	1.25708997249603
2007-01-01	1.39375996589661
2009-01-01	1.43201005458832
2010-01-01	1.44362998008728
2011-01-01	1.45127999782562
2012-01-01	1.48045003414154
2013-01-01	1.50637996196747
2014-01-01	1.52988994121552
2015-01-01	1.56352996826172
2016-01-01	1.67122995853424