Year	Number
2004-01-01	23515077
2005-01-01	27021471
2006-01-01	29520295
2007-01-01	32828123
2008-01-01	37469605
2009-01-01	35815787
2010-01-01	40762319
2011-01-01	46351774
2012-01-01	49867417
2013-01-01	54357046
2014-01-01	57605253
2015-01-01	57509336
2016-01-01	57897182
2017-01-01	65239181