Year	Number
2008-01-01	0.6840
2009-01-01	0.7347
2010-01-01	0.7604
2011-01-01	0.5527
2012-01-01	0.5955
2013-01-01	0.6148
2014-01-01	0.5308
2015-01-01	0.5285
2016-01-01	0.5536
2017-01-01	0.5698