Year	Number
2004-01-01	6318
2005-01-01	5475
2006-01-01	7516
2007-01-01	7657
2008-01-01	7903
2009-01-01	8026
2010-01-01	8271
2011-01-01	9215
2012-01-01	10485
2013-01-01	9495
2014-01-01	22175
2015-01-01	13495
2016-01-01	15973