Year	Number
2004-01-01	362
2005-01-01	511
2006-01-01	685
2007-01-01	1285
2008-01-01	1918
2009-01-01	2035
2010-01-01	2247
2011-01-01	2366
2012-01-01	2496
2013-01-01	2698
2014-01-01	2813
2015-01-01	2756