Year	Number
2004-01-01	2370
2005-01-01	2327
2006-01-01	9599
2007-01-01	11303
2008-01-01	14760
2009-01-01	18067
2010-01-01	17257
2011-01-01	19460
2012-01-01	22021
2013-01-01	20734
2014-01-01	19552
2015-01-01	20597
2016-01-01	26974