Year	Number
2004-01-01	169
2005-01-01	219
2006-01-01	347
2007-01-01	412
2008-01-01	516
2009-01-01	603
2010-01-01	895
2011-01-01	1050
2012-01-01	1177
2013-01-01	1372
2014-01-01	1428
2015-01-01	1512
2016-01-01	1545