Year	Number
2005-01-01	1951917
2006-01-01	1933118
2007-01-01	2731376
2008-01-01	3643602
2009-01-01	3805916
2010-01-01	4352049
2011-01-01	4405484
2012-01-01	4528931
2013-01-01	6283838
2014-01-01	6049674
2015-01-01	6247766