Year	Number
2004-01-01	276941
2005-01-01	301615
2006-01-01	316266
2007-01-01	367370
2008-01-01	402392
2009-01-01	434935
2010-01-01	458513
2011-01-01	491094
2012-01-01	540882
2013-01-01	561245
2014-01-01	426213
2015-01-01	415503
2016-01-01	411667