Year	Number
2004-01-01	1479
2005-01-01	1606
2006-01-01	1808
2007-01-01	1958
2008-01-01	2103
2009-01-01	2242
2010-01-01	2310
2011-01-01	2384
2012-01-01	2460
2013-01-01	2483
2014-01-01	2528
2015-01-01	2518