Year	Number
2004-01-01	5504
2005-01-01	6505
2006-01-01	6971
2007-01-01	8384
2008-01-01	9055
2009-01-01	13138
2010-01-01	13828
2011-01-01	14958
2012-01-01	16106
2013-01-01	15321
2014-01-01	19561
2015-01-01	17158
2016-01-01	18971