Year	Number
2004-01-01	7025
2005-01-01	7538
2006-01-01	13635
2007-01-01	19368
2008-01-01	19109
2009-01-01	25740
2010-01-01	27976
2011-01-01	26352
2012-01-01	25087
2013-01-01	16234
2014-01-01	16489
2015-01-01	15107
2016-01-01	15345