Year	Number
2004-01-01	55
2005-01-01	243
2006-01-01	279
2007-01-01	354
2009-01-01	118
2010-01-01	204
2011-01-01	228
2012-01-01	281
2013-01-01	334
2014-01-01	473
2015-01-01	571
2016-01-01	639