Year	Number
2004-01-01	12907
2005-01-01	13429
2006-01-01	14364
2007-01-01	16982
2008-01-01	17714
2009-01-01	18414
2010-01-01	20179
2011-01-01	21892
2012-01-01	24079
2013-01-01	31641
2014-01-01	47117
2015-01-01	40557
2016-01-01	52925