Year	Number
2004-01-01	6462
2005-01-01	7135
2006-01-01	7218
2007-01-01	7574
2008-01-01	13680
2009-01-01	11069
2010-01-01	11734
2011-01-01	11681
2012-01-01	14061
2013-01-01	19905
2014-01-01	26135
2015-01-01	15478