Year	Number
2004-01-01	7055597
2005-01-01	10557576
2006-01-01	11744564
2007-01-01	11897460
2008-01-01	12472289
2009-01-01	11652578
2010-01-01	9412336
2011-01-01	8819719
2012-01-01	7758634
2013-01-01	7029573
2014-01-01	6719089
2015-01-01	6761732
2016-01-01	6594411
2017-01-01	6296770