Year	Number
2004-01-01	644
2005-01-01	754
2006-01-01	653
2007-01-01	622
2008-01-01	602
2009-01-01	588
2010-01-01	571
2011-01-01	311
2012-01-01	293
2013-01-01	190
2014-01-01	187
2015-01-01	247
2016-01-01	239
2017-01-01	421