Year	Number
2004-01-01	139457
2005-01-01	146795
2006-01-01	147535
2007-01-01	153162
2008-01-01	159289
2009-01-01	165599
2010-01-01	174920
2011-01-01	173864
2012-01-01	175139
2013-01-01	182538
2014-01-01	184446
2015-01-01	182378
2016-01-01	180150
2017-01-01	174879