Year	Number
2004-01-01	1662153
2005-01-01	1936256
2006-01-01	2342260
2007-01-01	3304592
2008-01-01	4308941
2009-01-01	3620004
2010-01-01	3869413
2011-01-01	4291052
2012-01-01	4743695
2013-01-01	5085261
2014-01-01	5250911
2015-01-01	5356599
2016-01-01	5364411
2017-01-01	5333728