Year	Number
2004-01-01	1887
2005-01-01	2019
2006-01-01	2287
2007-01-01	2321
2008-01-01	2419
2009-01-01	2476
2010-01-01	2498
2011-01-01	2662
2012-01-01	2625
2013-01-01	2564
2014-01-01	2548
2015-01-01	2548