Year	Number
2004-01-01	3401
2005-01-01	3527
2006-01-01	3671
2007-01-01	3877
2008-01-01	4125
2009-01-01	4101
2010-01-01	4025
2011-01-01	3866
2012-01-01	3651
2013-01-01	3135
2014-01-01	2709
2015-01-01	2561
2016-01-01	2348
2017-01-01	2184