Year	Number
2009-01-01	0.3943
2010-01-01	0.4376
2011-01-01	0.4506
2012-01-01	0.4896
2013-01-01	0.5069
2014-01-01	0.5459
2015-01-01	0.5633
2016-01-01	0.5936
2017-01-01	0.6239