Year	Number
2004-01-01	12356
2005-01-01	14230
2006-01-01	14358
2007-01-01	16251
2008-01-01	17025
2009-01-01	23201
2010-01-01	23265
2011-01-01	22189
2012-01-01	10959
2013-01-01	42452