Year	Number
2004-01-01	1753
2005-01-01	2279
2006-01-01	3606
2007-01-01	4415
2008-01-01	5191
2009-01-01	5660
2010-01-01	5793
2011-01-01	5955
2012-01-01	5864
2013-01-01	5861
2014-01-01	5788
2015-01-01	5705
2016-01-01	5860
2017-01-01	5773