Year	Number
2004-01-01	178313
2005-01-01	211376
2006-01-01	198962
2007-01-01	236254
2008-01-01	279254
2009-01-01	252922
2010-01-01	349133
2011-01-01	405268
2012-01-01	423030
2013-01-01	480285
2014-01-01	660678
2015-01-01	557031
2016-01-01	558719