Year Number of Firms 1992-01-01 308 1997-01-01 450 2002-01-01 507 2003-01-01 511 2004-01-01 519 2005-01-01 528 2006-01-01 541 2007-01-01 603 2008-01-01 582 2009-01-01 514 2010-01-01 560 2011-01-01 593 2012-01-01 615 2013-01-01 599 2014-01-01 629 2015-01-01 641 2016-01-01 723