Year	Number
2004-01-01	8051658
2005-01-01	10522055
2006-01-01	12749393
2007-01-01	14337853
2008-01-01	14966336
2009-01-01	13508290
2010-01-01	14671902
2011-01-01	15016961
2012-01-01	15672674
2013-01-01	16101774
2014-01-01	16338548
2015-01-01	16321064
2016-01-01	16598669