Year	Number
2004-01-01	85
2005-01-01	150
2006-01-01	325
2007-01-01	488
2008-01-01	717
2009-01-01	995
2010-01-01	1289
2011-01-01	1629
2012-01-01	2014
2013-01-01	2334
2014-01-01	2589
2015-01-01	2776