Year	Number
2004-01-01	491
2005-01-01	591
2006-01-01	715
2007-01-01	884
2008-01-01	1026
2009-01-01	1116
2010-01-01	1152
2011-01-01	1238
2012-01-01	1428
2013-01-01	1475
2014-01-01	1632
2015-01-01	1708
2016-01-01	1991