Year	Number
2004-01-01	4214
2005-01-01	4843
2006-01-01	6285
2007-01-01	9193
2008-01-01	10555
2009-01-01	12849
2010-01-01	19672
2011-01-01	23398
2012-01-01	26762
2013-01-01	25203
2014-01-01	25730
2015-01-01	23143
2016-01-01	32926
2017-01-01	18538