Year	Number
2004-01-01	1568
2005-01-01	1720
2006-01-01	1918
2007-01-01	2147
2008-01-01	2367
2009-01-01	2472
2010-01-01	2544
2011-01-01	2697
2012-01-01	2856
2013-01-01	3036
2014-01-01	3234
2015-01-01	3486