Year	Number
2004-01-01	4104
2005-01-01	4588
2006-01-01	6079
2007-01-01	7543
2008-01-01	8893
2009-01-01	9950
2010-01-01	10885
2011-01-01	11766
2012-01-01	12712
2013-01-01	13883
2014-01-01	15516
2015-01-01	17223
2016-01-01	17887