Year	Number
2004-01-01	0
2005-01-01	0
2006-01-01	0
2007-01-01	0
2008-01-01	14589
2009-01-01	15605
2010-01-01	20004
2011-01-01	26894
2012-01-01	25225
2013-01-01	22755