Year	Number
2006-01-01	80799
2007-01-01	106449
2008-01-01	130042
2009-01-01	171490
2010-01-01	231887
2011-01-01	284817
2012-01-01	375386
2013-01-01	461749
2014-01-01	499107
2015-01-01	595539