Year	Number
2005-01-01	132
2006-01-01	274
2007-01-01	383
2008-01-01	574
2009-01-01	759
2010-01-01	953
2011-01-01	1188
2012-01-01	1452
2013-01-01	1648
2014-01-01	1811
2015-01-01	1951