Year	Number
2004-01-01	15887222
2005-01-01	21106093
2006-01-01	27535035
2007-01-01	34014118
2008-01-01	30662339
2009-01-01	25755136
2010-01-01	26803127
2011-01-01	43244964
2012-01-01	44562601
2013-01-01	49780245
2014-01-01	51066320
2015-01-01	46304367
2016-01-01	46899905