Year	Number
2004-01-01	148
2005-01-01	148
2006-01-01	147
2007-01-01	149
2008-01-01	147
2009-01-01	148
2010-01-01	145
2011-01-01	142
2012-01-01	138
2013-01-01	137
2014-01-01	137
2015-01-01	134
2016-01-01	137