Year	Number
2004-01-01	516087
2005-01-01	509258
2006-01-01	551177
2007-01-01	604165
2008-01-01	854640
2009-01-01	926483
2010-01-01	1348734
2011-01-01	1674600
2012-01-01	1977947
2013-01-01	2322802