Year	Number
2004-01-01	521
2005-01-01	501
2006-01-01	491
2007-01-01	489
2008-01-01	492
2009-01-01	488
2010-01-01	492
2011-01-01	497
2012-01-01	498
2013-01-01	498
2014-01-01	461
2015-01-01	450