Year	Number
2009-01-01	38137468
2010-01-01	37461227
2011-01-01	40569011
2012-01-01	43884035
2013-01-01	46714131
2014-01-01	50385807
2015-01-01	55323721
2016-01-01	57006932
2017-01-01	62156503