Year	Number
2004-01-01	17
2005-01-01	19
2006-01-01	19
2007-01-01	120
2008-01-01	131
2009-01-01	131
2010-01-01	133
2011-01-01	133
2012-01-01	148
2013-01-01	135
2014-01-01	135
2015-01-01	119
2016-01-01	130