Year	Number
2004-01-01	601
2005-01-01	1576
2006-01-01	1690
2007-01-01	2057
2008-01-01	2453
2009-01-01	3599
2010-01-01	3758
2011-01-01	4172
2012-01-01	4492
2013-01-01	4664
2014-01-01	4847
2015-01-01	5119
2016-01-01	5243