Year	Number
2004-01-01	773
2005-01-01	872
2006-01-01	987
2007-01-01	1158
2008-01-01	1261
2009-01-01	1409
2010-01-01	1499
2011-01-01	1827
2012-01-01	1929
2013-01-01	2609
2014-01-01	2928
2015-01-01	2287
2016-01-01	2422
2017-01-01	2494