Year	Number
2004-01-01	246
2005-01-01	246
2006-01-01	246
2007-01-01	246
2008-01-01	246
2009-01-01	248
2010-01-01	251
2011-01-01	250
2012-01-01	244
2013-01-01	244
2014-01-01	253
2015-01-01	268
2016-01-01	276
2017-01-01	275