Year	Number
2004-01-01	9033417
2005-01-01	11629827
2006-01-01	14008597
2007-01-01	14987145
2008-01-01	14816116
2009-01-01	16308322
2010-01-01	13003853
2011-01-01	15361480
2012-01-01	16330410
2013-01-01	16168668
2014-01-01	15264827
2015-01-01	14674954
2016-01-01	12713182
2017-01-01	14285116