Year	Number
2004-01-01	13589
2005-01-01	15357
2006-01-01	16432
2007-01-01	17422
2008-01-01	17812
2009-01-01	17171
2010-01-01	14740
2011-01-01	14919
2012-01-01	15055
2013-01-01	14900
2014-01-01	17115
2015-01-01	17330
2016-01-01	16956