Year	Number
2004-01-01	14914
2005-01-01	31103
2006-01-01	36429
2007-01-01	40534
2008-01-01	41462
2009-01-01	30783
2010-01-01	28768
2011-01-01	39127
2012-01-01	39944
2013-01-01	33204
2014-01-01	39407
2015-01-01	41486
2016-01-01	48961