Year	Number
2004-01-01	14296943
2005-01-01	14915525
2006-01-01	16048103
2007-01-01	17505312
2008-01-01	17828761
2009-01-01	11118887
2010-01-01	13133728
2011-01-01	13743858
2012-01-01	14795065
2013-01-01	15370514
2014-01-01	16034142
2015-01-01	15886709
2016-01-01	15672422