Year	Number
2006-01-01	144
2007-01-01	170
2008-01-01	185
2009-01-01	198
2010-01-01	204
2011-01-01	201
2012-01-01	203
2013-01-01	204
2014-01-01	192
2015-01-01	190
2016-01-01	190