Year	Number
2004-01-01	4170
2005-01-01	4487
2006-01-01	4734
2007-01-01	5029
2008-01-01	5321
2009-01-01	5499
2010-01-01	5704
2011-01-01	5895
2012-01-01	6139
2013-01-01	6137
2014-01-01	5650
2015-01-01	5785
2016-01-01	5834