Year	Number
2004-01-01	710812
2005-01-01	759593
2006-01-01	789657
2007-01-01	784946
2008-01-01	1027543
2009-01-01	1285841
2010-01-01	1508037
2011-01-01	1476453
2012-01-01	1483803
2013-01-01	1969509
2014-01-01	2116655
2015-01-01	2219201