Year	Number
2004-01-01	18110
2005-01-01	20000
2006-01-01	21496
2007-01-01	24072
2008-01-01	19011
2009-01-01	16556
2010-01-01	24006
2011-01-01	38764
2012-01-01	38517
2013-01-01	43710
2014-01-01	46627
2015-01-01	54951
2016-01-01	52217
2017-01-01	52903