Year	Number
2004-01-01	510050
2005-01-01	497165
2006-01-01	558449
2007-01-01	609658
2008-01-01	731255
2009-01-01	664556
2010-01-01	746927
2011-01-01	996718
2012-01-01	1020545
2013-01-01	1192314
2014-01-01	1347859
2015-01-01	1362266
2016-01-01	1597066