Year	Number
2004-01-01	19340352
2005-01-01	18879492
2006-01-01	20911160
2007-01-01	23569436
2008-01-01	23159888
2009-01-01	23799096
2010-01-01	23502812
2011-01-01	23563340
2012-01-01	24039740
2013-01-01	28667696
2014-01-01	29983096
2015-01-01	29145213
2016-01-01	29273677
2017-01-01	34631977