Year	Number
2004-01-01	5085364
2005-01-01	6978299
2006-01-01	8119856
2007-01-01	8642757
2008-01-01	10803655
2009-01-01	12486775
2010-01-01	13863772
2011-01-01	16517667
2012-01-01	16365173
2013-01-01	16371524
2014-01-01	16416137
2015-01-01	15200626
2016-01-01	15058162