Year	Number
2004-01-01	4436635
2005-01-01	6046762
2006-01-01	7487777
2007-01-01	7636697
2008-01-01	8045657
2009-01-01	8575377
2010-01-01	8643191
2011-01-01	11763592
2012-01-01	12773240
2013-01-01	11629014
2014-01-01	11572999
2015-01-01	11073802
2016-01-01	11069044
2017-01-01	12418085