Year	Number
2005-01-01	18434
2006-01-01	23587
2007-01-01	22805
2008-01-01	21026
2009-01-01	18226
2010-01-01	18895
2011-01-01	17727
2012-01-01	15800
2013-01-01	15110
2014-01-01	14525
2015-01-01	15602
2016-01-01	16163
2017-01-01	17320