Year	Number
2004-01-01	210
2005-01-01	219
2006-01-01	271
2007-01-01	374
2008-01-01	503
2009-01-01	597
2010-01-01	653
2011-01-01	737
2012-01-01	866
2013-01-01	1081
2014-01-01	1134
2015-01-01	1299
2016-01-01	1507