Year	Number
2004-01-01	1637
2005-01-01	1866
2006-01-01	2005
2007-01-01	2141
2008-01-01	2334
2009-01-01	3030
2010-01-01	4233
2011-01-01	7814
2012-01-01	18346
2013-01-01	8374
2014-01-01	10215
2015-01-01	13133
2016-01-01	35525