Year	Number
2004-01-01	18371
2005-01-01	18207
2006-01-01	19574
2007-01-01	21479
2008-01-01	22559
2009-01-01	22534
2010-01-01	25411
2011-01-01	28032
2012-01-01	38435
2013-01-01	41371
2014-01-01	47139
2015-01-01	36705
2016-01-01	82063