Year	Number
2004-01-01	1288
2005-01-01	1441
2006-01-01	1558
2007-01-01	1685
2008-01-01	1809
2009-01-01	1953
2010-01-01	1962
2011-01-01	1961
2012-01-01	2276
2013-01-01	1916
2014-01-01	1691
2015-01-01	1972