Year	Number
2007-01-01	10.6672
2008-01-01	11.5416
2009-01-01	13.0482
2010-01-01	13.8015
2011-01-01	15.9403
2012-01-01	18.3481
2013-01-01	20.6753
2014-01-01	23.1504
2015-01-01	26.0694
2016-01-01	27.2263
2017-01-01	28.2889