Year	Number
2004-01-01	2657
2005-01-01	6369
2006-01-01	5410
2007-01-01	7873
2008-01-01	10233
2009-01-01	19405
2010-01-01	40408
2011-01-01	54875
2012-01-01	64675
2013-01-01	94853
2014-01-01	228467
2015-01-01	242015
2016-01-01	206461
2017-01-01	142879