Year	Number
2004-01-01	36767
2005-01-01	37539
2006-01-01	39926
2007-01-01	43840
2008-01-01	50122
2009-01-01	54292
2010-01-01	50939
2011-01-01	51851
2012-01-01	50851
2013-01-01	47923
2014-01-01	48422
2015-01-01	50437
2016-01-01	49285