Year	Number
2004-01-01	29499
2005-01-01	23508
2006-01-01	46937
2007-01-01	40080
2008-01-01	48782
2009-01-01	50646
2010-01-01	52414
2011-01-01	198992
2012-01-01	406728
2013-01-01	563136
2014-01-01	594893
2015-01-01	591859
2016-01-01	633727