Year Number 2004-01-01 3 2005-01-01 3 2006-01-01 3 2007-01-01 3 2008-01-01 3 2009-01-01 3 2010-01-01 3 2012-01-01 1 2013-01-01 1 2014-01-01 1 2015-01-01 1 2016-01-01 1