Year	Number
2004-01-01	20370
2005-01-01	25006
2006-01-01	23766
2007-01-01	19979
2008-01-01	26763
2009-01-01	30809
2010-01-01	36771
2011-01-01	43409
2012-01-01	48922
2013-01-01	39898
2014-01-01	45532
2015-01-01	51952
2016-01-01	68912