Year	Number
2004-01-01	30
2005-01-01	30
2006-01-01	35
2007-01-01	25
2008-01-01	76
2009-01-01	147
2010-01-01	157
2011-01-01	177
2012-01-01	187
2013-01-01	225
2014-01-01	217
2015-01-01	233