Year	Number
2004-01-01	660
2005-01-01	664
2006-01-01	676
2007-01-01	673
2008-01-01	687
2009-01-01	671
2010-01-01	651
2011-01-01	571
2012-01-01	554
2013-01-01	545
2014-01-01	524
2015-01-01	497
2016-01-01	452
2017-01-01	428