Year	Number
2007-01-01	2260
2008-01-01	2591
2009-01-01	3189
2010-01-01	3611
2011-01-01	3885
2012-01-01	3815
2013-01-01	5658
2014-01-01	7202
2015-01-01	13077
2016-01-01	15595