Year	Number
2006-01-01	1669
2007-01-01	1658
2008-01-01	1652
2009-01-01	1653
2010-01-01	1649
2011-01-01	1641
2012-01-01	1616
2013-01-01	1652
2014-01-01	1637
2015-01-01	1546
2016-01-01	1457
2017-01-01	1498