Year	Number
2004-01-01	1470
2005-01-01	1629
2006-01-01	1875
2007-01-01	2001
2008-01-01	2220
2009-01-01	2860
2010-01-01	3997
2011-01-01	7448
2012-01-01	17988
2013-01-01	7829
2014-01-01	9558
2015-01-01	11183
2016-01-01	30602