Year	Number
2004-01-01	12166424
2005-01-01	16829304
2006-01-01	21848593
2007-01-01	24540342
2008-01-01	26392561
2009-01-01	30472757
2010-01-01	34567003
2011-01-01	36351284
2012-01-01	48712871
2013-01-01	58195811
2014-01-01	62026320
2015-01-01	60887135
2016-01-01	64990899