Year	Number
2004-01-01	1533
2005-01-01	2194
2006-01-01	4593
2007-01-01	7058
2008-01-01	9508
2009-01-01	10858
2010-01-01	11457
2011-01-01	13067
2012-01-01	14688
2013-01-01	13409
2014-01-01	17820
2015-01-01	21054
2016-01-01	23592
2017-01-01	25911