Year	Number
2004-01-01	5042
2005-01-01	6819
2006-01-01	5512
2007-01-01	7849
2008-01-01	9137
2009-01-01	10736
2010-01-01	11183
2011-01-01	10471
2012-01-01	11843
2013-01-01	13691
2014-01-01	14200
2015-01-01	7876
2016-01-01	6840
2017-01-01	7539