Year	Number
2004-01-01	40749
2005-01-01	44365
2006-01-01	47568
2007-01-01	49388
2008-01-01	56548
2009-01-01	15904
2010-01-01	14119
2011-01-01	15651
2012-01-01	16190
2013-01-01	19108
2014-01-01	21551
2015-01-01	22291
2016-01-01	24614
2017-01-01	27692