Year	Number
2004-01-01	131
2005-01-01	133
2006-01-01	135
2007-01-01	140
2008-01-01	144
2009-01-01	152
2010-01-01	154
2011-01-01	154
2012-01-01	135
2013-01-01	140
2014-01-01	140
2015-01-01	139
2016-01-01	140