Year	Number
2004-01-01	160
2005-01-01	165
2006-01-01	170
2007-01-01	175
2008-01-01	184
2009-01-01	182
2010-01-01	176
2011-01-01	176
2012-01-01	176
2013-01-01	180
2014-01-01	163
2015-01-01	120
2016-01-01	100
2017-01-01	84