Year	Number
2004-01-01	561
2005-01-01	586
2006-01-01	635
2007-01-01	738
2008-01-01	944
2009-01-01	962
2010-01-01	995
2011-01-01	1040
2012-01-01	1159
2013-01-01	1183
2014-01-01	1222
2015-01-01	1260