Year	Number
2004-01-01	19737
2005-01-01	27779
2006-01-01	39475
2007-01-01	54804
2008-01-01	75018
2009-01-01	88128
2010-01-01	116161
2011-01-01	141896
2012-01-01	171909
2013-01-01	188789
2014-01-01	222761
2015-01-01	206852
2016-01-01	201396