Year	Number
2004-01-01	294451
2005-01-01	347044
2006-01-01	450128
2007-01-01	600485
2008-01-01	825652
2009-01-01	871412
2010-01-01	978077
2011-01-01	354429
2012-01-01	215214
2013-01-01	292386
2014-01-01	371378
2015-01-01	231030