Year	Number
2004-01-01	14648017
2005-01-01	15909296
2006-01-01	17577905
2007-01-01	21695503
2008-01-01	25408860
2009-01-01	28569285
2010-01-01	29478857
2011-01-01	31931184
2012-01-01	35880062
2013-01-01	39387073
2014-01-01	43009594