Year	Number
2004-01-01	197
2005-01-01	242
2006-01-01	291
2007-01-01	399
2008-01-01	511
2009-01-01	524
2010-01-01	529
2011-01-01	534
2012-01-01	538
2013-01-01	529
2014-01-01	499
2015-01-01	500
2016-01-01	493