Year	Number
2004-01-01	42487
2005-01-01	39877
2006-01-01	35222
2007-01-01	29191
2008-01-01	24917
2009-01-01	20805
2010-01-01	17013
2011-01-01	17942
2012-01-01	19522
2013-01-01	21237
2014-01-01	22457
2015-01-01	23747
2016-01-01	24935