Year	Number
2004-01-01	9491
2005-01-01	8144
2006-01-01	8785
2007-01-01	10258
2008-01-01	14909
2009-01-01	18041
2010-01-01	19926
2011-01-01	20961
2012-01-01	21255
2013-01-01	21990
2014-01-01	25240
2015-01-01	26942
2016-01-01	27436