Year	Number
2004-01-01	22333
2005-01-01	22187
2006-01-01	22057
2007-01-01	20963
2008-01-01	20934
2009-01-01	20717
2010-01-01	20651
2011-01-01	22007
2012-01-01	12806
2013-01-01	12889