Year	Number
2004-01-01	480564
2005-01-01	339684
2006-01-01	123596
2007-01-01	224904
2008-01-01	237298
2009-01-01	270206
2010-01-01	355590
2011-01-01	425353
2012-01-01	501698
2013-01-01	548880