Year	Number
2004-01-01	2615776
2005-01-01	3246108
2006-01-01	3618399
2007-01-01	4507216
2008-01-01	5202047
2009-01-01	5831319
2010-01-01	6703073
2011-01-01	16993146
2012-01-01	16847702
2013-01-01	16881748
2014-01-01	17010426
2015-01-01	16051787
2016-01-01	16077552