Year	Number
2005-01-01	8216193
2006-01-01	9736965
2007-01-01	10814742
2008-01-01	11375720
2009-01-01	11669984
2010-01-01	12527245
2011-01-01	13719289
2012-01-01	15036920
2013-01-01	16349681
2014-01-01	17229697
2015-01-01	17861651
2016-01-01	18390527