Year	Number
2004-01-01	1878554
2005-01-01	1876142
2006-01-01	1978713
2007-01-01	2111661
2008-01-01	2519557
2009-01-01	2558495
2010-01-01	2932590
2011-01-01	3265128
2012-01-01	3617341
2013-01-01	3988494