Year	Number
2004-01-01	5882570
2005-01-01	6468456
2006-01-01	6264696
2007-01-01	6820763
2008-01-01	8049621
2009-01-01	9001410
2010-01-01	10027510
2011-01-01	11665115
2012-01-01	12856470
2013-01-01	14324136
2014-01-01	15587721
2015-01-01	16257655
2016-01-01	15983027
2017-01-01	15061714