Year Number 2004-01-01 28 2005-01-01 32 2006-01-01 49 2007-01-01 57 2008-01-01 79 2009-01-01 84 2010-01-01 85 2011-01-01 85 2012-01-01 85 2013-01-01 87 2014-01-01 85 2015-01-01 83