Year	Number
2004-01-01	147
2005-01-01	148
2006-01-01	150
2007-01-01	154
2008-01-01	157
2009-01-01	164
2010-01-01	165
2011-01-01	167
2012-01-01	170
2013-01-01	171
2014-01-01	171
2015-01-01	172
2016-01-01	173
2017-01-01	175