Year	Number of Firms
2003-01-01	2
2004-01-01	1
2005-01-01	2
2006-01-01	2
2007-01-01	4
2008-01-01	4
2009-01-01	4
2010-01-01	4
2011-01-01	4
2014-01-01	1
2015-01-01	4
2016-01-01	4