Year	Number
2004-01-01	644941
2005-01-01	1026369
2006-01-01	1092402
2007-01-01	1338837
2008-01-01	1787533
2009-01-01	1829347
2010-01-01	1899829
2011-01-01	1992464
2012-01-01	2180869
2013-01-01	2421185