Year	Number
2004-01-01	8054
2005-01-01	8776
2006-01-01	9938
2007-01-01	11542
2008-01-01	13878
2009-01-01	15714
2010-01-01	16413
2011-01-01	17392
2012-01-01	18188
2013-01-01	18876
2014-01-01	20531
2015-01-01	22143
2016-01-01	23416