Year	Number
2004-01-01	200335
2005-01-01	222859
2006-01-01	285225
2007-01-01	328390
2008-01-01	390741
2009-01-01	430268
2010-01-01	462241
2011-01-01	1885125
2012-01-01	2459611
2013-01-01	3480909
2014-01-01	3736308
2015-01-01	4062625
2016-01-01	4266683