Year	Number
2004-01-01	1727
2005-01-01	3133
2006-01-01	2760
2007-01-01	3123
2008-01-01	3629
2009-01-01	4144
2010-01-01	4545
2011-01-01	5024
2012-01-01	5476
2013-01-01	5893
2014-01-01	6234
2015-01-01	6529
2016-01-01	6821
2017-01-01	7001