Year	Number
2007-01-01	13458
2008-01-01	18839
2009-01-01	25645
2010-01-01	30376
2011-01-01	32562
2012-01-01	26187
2013-01-01	27633
2014-01-01	43306
2015-01-01	20913
2016-01-01	21964