Year	Number
2004-01-01	22473
2005-01-01	23952
2006-01-01	25752
2007-01-01	26067
2008-01-01	27081
2009-01-01	27067
2010-01-01	30092
2011-01-01	30841
2012-01-01	30333
2013-01-01	30222
2014-01-01	31464
2015-01-01	31661
2016-01-01	32879