Year	Number
2004-01-01	3908
2005-01-01	4224
2006-01-01	4695
2007-01-01	5081
2008-01-01	5455
2009-01-01	5773
2010-01-01	5945
2011-01-01	6170
2012-01-01	6409
2013-01-01	6685
2014-01-01	6975
2015-01-01	7030
2016-01-01	6986