Year	Number
2004-01-01	748
2005-01-01	763
2006-01-01	973
2007-01-01	1730
2008-01-01	1994
2009-01-01	3052
2010-01-01	3418
2011-01-01	4311
2012-01-01	5516
2013-01-01	6082
2014-01-01	6733
2015-01-01	7198