Year	Number
2004-01-01	144
2005-01-01	148
2006-01-01	151
2007-01-01	152
2008-01-01	160
2009-01-01	160
2010-01-01	156
2011-01-01	162
2012-01-01	164
2013-01-01	174
2014-01-01	180
2015-01-01	185
2016-01-01	186