Year	Number
2004-01-01	6106
2005-01-01	7733
2006-01-01	12156
2007-01-01	13507
2008-01-01	13200
2009-01-01	18185
2010-01-01	17726
2011-01-01	18068
2012-01-01	17977
2013-01-01	14674
2014-01-01	14730
2015-01-01	15358
2016-01-01	16415